#include <bits/stdc++.h>
using namespace std;

int main() {
    iostream::sync_with_stdio(0);
	cin.tie(0);

	int n;
    cin >> n;

    int remainder = 0;
    long long curr;

    for(int i = 0; i < n; i++) {
        cin >> curr;

        curr += remainder;

        remainder = curr / 10;
    }

    string currStr = to_string(curr);

    cout << currStr[0];

    for(int i = 0; i < currStr.size() - 1 + n - 1; i++) {
        cout << "0";
    }

    cout << endl;
}