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#include<cstdio>                                                                
#include<iostream>                                                              
#include<algorithm>                                                             
#include<string>                                                                
#include<vector>                                                                
#include<set>     
#include<cmath>                                                              
                                                                                
using namespace std;                                                            
                                                                                
typedef vector<int> VI;                                                         
typedef long long LL;                                                           
                                                                                
#define FOR(x, b, e) for(int x=b; x<=(e); ++x)                                  
#define FORD(x, b, e) for(int x=b; x>=(e); --x)                                 
#define REP(x, n) for(int x=0; x<(n); ++x)                                      
#define VAR(v, n) __typeof(n) v = (n)                                           
#define ALL(c) (c).begin(), (c).end()                                           
#define SIZE(x) ((int)(x).size())                                               
#define FOREACH(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)             
#define PB push_back                                                            
#define ST first                                                                
#define ND second                                                                                                                                          
                                                                                
class Solver {                                                                  
    int n, last;                                                                      
    public:

    void readInput() {
        cin >> n >> last;
    }

    int getLength(int a) {
        return std::to_string(a).size();
    }       

    void printLog(int a, int zeros, int last, int res) {
        printf("%d", a);
        for(int i=0;i<zeros - getLength(last);i++) {
            printf("0");
        }
        if(zeros > 0)
            printf("%d", last);
        printf(" - %d\n", res);
    }                                                               
                                                                                
    void solve() {
        LL result = 0;
        int lastAdded = 0, lastEnding = 0;
        int current, currentAdded, currentEnding;
        for(int i = 1; i < n; i++) {
            cin >> current;
            if(current == last) {
                currentEnding = lastAdded == 0 ? 0 : lastEnding + 1;
                currentAdded = max(lastAdded, getLength(currentEnding));
                if(currentAdded > lastAdded) {
                    currentEnding = 0;
                }
            } else if (current < last) {
                int cl = getLength(current);
                int ll = getLength(last);
                if(cl == ll) {
                    currentAdded = lastAdded + 1;
                    currentEnding = 0;
                } else {
                    int tmp = 1;
                    for(int i = 0; i < ll - cl; i++) {
                        tmp *= 10;
                    }
                    if(current > last/tmp) {
                        currentAdded = lastAdded + ll - cl;
                        currentEnding = 0;
                    } else if(current < last/tmp) {
                        currentAdded = lastAdded + ll - cl + 1;
                        currentEnding = 0;
                    } else {
                        if (lastAdded > 0 && getLength(lastEnding + 1) <= lastAdded) {
                            currentAdded = lastAdded;
                            currentEnding = lastEnding + 1;
                            current = last;
                            result += ll - cl;
                        } else if(last%tmp + 1 < tmp) {
                            currentAdded = lastAdded;
                            current = last + 1;
                            result += ll - cl;
                            currentEnding = 0;
                        } else {
                            currentAdded = lastAdded + 1 + ll - cl;
                            currentEnding = 0;
                        }
                    }
                }
            } else {
                int cl = getLength(current);
                int ll = getLength(last);
                if (cl == ll) {
                    currentAdded = lastAdded;
                    currentEnding = 0;
                } else {
                    int tmp = 1;
                    for(int i = 0; i < cl - ll; i++) {
                        tmp *= 10;
                    }
                    if(current/tmp > last) {
                        currentAdded = max(0,lastAdded - (cl - ll));
                        currentEnding = 0;
                    } else if(current/tmp < last) {
                        currentAdded = max(0,lastAdded + 1 - (cl - ll));
                        currentEnding = 0;
                    } else {
                        if(lastAdded < cl - ll) {
                            currentAdded = 0;
                            currentEnding = 0;
                        } else {
                            last *= tmp;
                            int zeros = lastAdded - getLength(lastEnding);
                            lastAdded -= cl - ll;
                            if(zeros < cl - ll) {
                                tmp = 1;
                                for(int i = 0; i < lastAdded; i++) tmp *= 10;
                                last += lastEnding/tmp;
                                lastEnding %= tmp;
                            }
                            if(current > last) {
                                currentAdded = lastAdded;
                                currentEnding = 0;
                            } else if(current < last) {
                                currentAdded = lastAdded + 1;
                                currentEnding = 0;
                            } else {                              
                                currentEnding = lastAdded == 0 ? 0 : lastEnding + 1;
                                currentAdded = max(lastAdded, getLength(currentEnding));
                                if(currentAdded > lastAdded) {
                                    currentEnding = 0;
                                }
                            }
                        }
                    }
                }
            }
            last = current;
            lastAdded = currentAdded;
            lastEnding = currentEnding;
            result += currentAdded;
            //printLog(current, currentAdded, currentEnding, result);
        }
        cout << result << '\n';
    }                                                                           
};                                                                              
                                                                                
int main() {                                                                    
    ios_base::sync_with_stdio(0);                                               
    Solver solver;                                                              
    solver.readInput();                                                         
    solver.solve();                                                             
    return 0;                                                                   
}