#include <iostream>
#include <cmath>
#include <algorithm>

int len(long long x) {
    if (x < 10) return 1;
    else return 1 + len(x/10);
}

long long trans(long long a, int x) {
    if (x == 0) return a; else return 10 * trans(a, x- 1);
}

long long adjust(long long a, long long b) {
    return trans(a, len(b) - len(a));
}


int main() {
    std::ios::sync_with_stdio(false);
    int n;
    std::cin >> n;
    long long c = 0;
    long long sum = 0;
    long long a;
    long long current_length = 0;
    while (n--) {
        std::cin >> a;
        if (len(a) <= len(c) + current_length) {
            long long x = len(c) - len(a);
            long long low = adjust(a, c);
            if (c - low + 1LL >= trans(1, x)) {
                low *= 10;
                x++;
            }
            sum += x + current_length;
            a = low + std::max(0LL, c - low + 1);
            if (a >= trans(1, 15)) {
                a /= 10;
                current_length++;
            }
        }
        c = a;
    }
    std::cout << sum;
    return 0;
}