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#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <map>

using namespace std;

bool lessAsNumber(string a, string b) {
    bool res = false;
    if (a.size() != b.size()) {
        res = a.size() < b.size();
    } else {
        res = a < b;
    }

    return res;
}

int main() {
    ios_base::sync_with_stdio(false);

    int n;
    cin >> n;

    string a, b;
    long long result = 0;
    cin >> a;
    for (int i = 1; i < n; ++i) {
        cin >> b;
        // cout << b << "\t\t";
        if (lessAsNumber(a, b)) {
            a = b;
            // cout << b << endl;
            continue;
        }


        bool foo = a[0] < b[0];

        if (foo) {
            result += a.size() - b.size();
            b += string(a.size() - b.size(), '0');
        } else if (a.substr(0, b.size()) == b) {
            if (a[a.size() - 1] != '9') {
                for (int i = b.size(); i < a.size() - 1; ++i) {
                    b += a[i];
                    result++;
                }
                b += a[a.size() - 1] + 1;
                result++;
            } else {
                for (int i = b.size(); i <= a.size(); ++i) {
                    b += "0";
                    result++;
                }
            }
        } else {
            for (int i = b.size(); i < a.size(); ++i) {
                b += "0";
                result++;
            }
            if (!(a < b)) {
                b += "0";
                result++;
            }
        }
        // cout << b << endl;
        a = b;
    }

    cout << result << endl;
    return 0;
}