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

int main() {
    int budget, money = 0, interest = 0;
    for (int i = 1; i <= 12; i++) {
        cin >> budget;
        money += 300 - budget;
        if (money < 0) {
            cout << '-' << i;
            return 0;
        }
        while (money >= 100) {
            interest += 100;
            money -= 100;
        }
    }
    cout << money + interest * 1.2;
    return 0;
}