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#include <iostream>
#include <string>
#include <vector>

using namespace std;

string increment(string in){
    for(int i=in.size()-1; i>=0; i--){
        if(in[i]=='9'){
            in[i]='0';
        }
        else{
            in[i] += 1;
            return in;
        }
    }
    in = '1' + in;
    return in;
}

int main(){
    int n;
    cin>>n;
    vector <string> seq;
    string a;
    cin>>a; n--;
    long long counter =0;
    while(n){
        n--;
        string b;
        cin >> b;
        string c = increment(a);
        if(a.size()<b.size()) a = b;
        else if(b.size()<=c.size() && c.substr(0, b.size())==b){
            counter += (c.size()-b.size());
            a = c;
        } 
        else {
            int len = a.size()-b.size();
            while(len){
                len--;
                b += '0';
                counter ++;
            }
            if(a<b) a=b;
            else{
                b += '0';
                counter ++;
                a=b;
            }
        }
    }
    cout<<counter<<endl;
}