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

int a[13];
int flag = 1;//是否
int money = 0;
int mama = 0; 
int month = 0;

int main() {
	for (int i = 1; i <= 12;i++) {
		cin >> a[i];
	}
	for (int i = 1;i<=12;i++) {
		money += 300;
		money -= a[i];
		if (money < 0) flag = 0;month = i;break;
		mama += money / 100;
		money %= 100; 
	}
	if (flag == 1) {
		money += mama * 120;
		cout << money;
	}
	else{
		printf("-%d", &month);
	}
	return 0;
}