#include <iostream>
using namespace std;
int main() {
int remain = 0;
int save_total = 0;
bool flag = true;
for (int month = 1; month <= 12; ++month) {
int budget;
cin >> budget;
int current = remain + 300;
if (current < budget) {
cout << "-" << month << endl;
flag = false;
break;
}
int month_end = current - budget;
if (month_end >= 100) {
int save = (month_end / 100) * 100;
save_total += save;
remain = month_end - save;
} else {
remain = month_end;
}
}
if (flag) {
int final_money = remain + save_total * 1.2;
cout << final_money << endl;
}
return 0;
}
