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#include <iostream>
#include <vector>
#include <cmath>
#include <string>
#include <cstdio>
#include <cstdlib>

using namespace std;

string dodaj(string x){
    int i = x.size()-1;
    if(x[i]=='9'){
        x[i]='0';
        i--;
        for(; x[i]=='9';i--){
            x[i] = '0';
            if(i==0){
                x+='0';
                break;
            }
        }
    }
    x[i]++;

    return x;
}

bool comp(string a, string b){
    if(a.size()>b.size()) return 1;
    if(b.size()>a.size()) return 0;
    for(int i=0;i<a.size();i++){
        if(a[i]>b[i]) return 1;
        if(b[i]>a[i]) return 0;
    }
    return 0;
}

int main()
{
    int n;
    cin >> n;

    vector<string> a;

    string p;
    cin>>p;
    a.push_back(p);

    long long res=0;

    for(int i=1; i<n; i++){
        string x;
        cin>>x;

        if(comp(x, a[i-1])) a.push_back(x);
        else{
            string prev = dodaj(a[i-1]);

            if(prev.substr(0,x.size()) == x){
                a.push_back(prev);
                res+=(prev.size()-x.size());
            }
            else{
                long long licz=0;
                while(!comp(x,prev)){
                    x+='0';
                    licz++;
                }
                a.push_back(x);
                res+=licz;
            }
        }
    }
    cout << res;
    return 0;
}