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#include <iostream>
#include <vector>
#include <tuple>
#include <cmath>
#include <string>
using namespace std;

string add_one(string a){
    a[a.length() - 1] += 1;
    for(int i=a.length() - 1; i>0; i--){
        if((int)a[i] > 57){
            a[i - 1] += 1;
            a[i] -= 10;
        }
        else{
            break;
        }
    }
    if((int)a[0] > 57){
        a[0] -= 10;
        a = '1' + a;
    }
    return a;
}

bool is_greater(string a, string b){
    if(a.length() > b.length()){
        return true;
    }
    if(a.length() < b.length()){
        return false;
    }
    for(int i=0;i<a.length();i++){
        if((int)a[i] > (int)b[i]){
            return true;
        }
        if((int)a[i] < (int)b[i]){
            return false;
        }
    }
    return false;
}

tuple<unsigned long, string> make_greater(string a, const string &b) {
    unsigned long res = 0;
    string sub = b.substr(0, a.length());
    if(is_greater(a, sub)){
        res = b.length() - a.length();
        string zeros;
        zeros.resize(res, '0');

        return make_tuple(res, a.append(zeros));
    }

    if(is_greater(sub, a)){
        res = b.length() - a.length() + 1;
        string zeros;
        zeros.resize(res, '0');
        return make_tuple(res, a.append(zeros));
    }


    string temp = add_one(b.substr(a.length(), b.length() - a.length()));
    if(b.length() - a.length() < temp.length()){
        res = b.length() - a.length() + 1;
        string zeros;
        zeros.resize(res, '0');
        return make_tuple(res, a.append(zeros));
    }
    else{
        res = b.length() - a.length();
        return make_tuple(res, a.append(temp));
    }

}



int main() {
    ios_base::sync_with_stdio(0);
    unsigned long n;
    cin >> n;
    vector<string> vec(n);
    long long int res = 0;
    for (unsigned long i = 0; i < n; i++) {
        cin >> vec[i];
    }
    string a;
    long long int r;
    for (unsigned long i = 1; i < n; i++) {

        if (!is_greater(vec[i], vec[i-1])) {
            tie(r, a) = make_greater(vec[i], vec[i-1]);
            res += r;
            vec[i] = a;
        }
    }

    cout << res;
    return 0;
}