#include<stdlib.h>
#include<iostream>
using namespace std;

   int main() {
   int money;    //每月预算 
   int sum = 0;  //存在妈妈那里的钱 
 	int s1 = 0;   //每月余额 
   for (int i = 1; i <= 12; i++)
        {
	 cin >> money;
	 s1 = 300 - money + s1;
	 if (s1 < 0)
	{
		cout << -i;
		exit(0);
	}
else if (s1 >= 0 && s1 < 100)
       {
	s1 = s1;
	}
    else  if (s1 >= 100)
{
sum = sum + (s1 / 100) * 100;
s1 = s1 - (s1 / 100) * 100; //更新每> > 月余额 
		}

	}
	if (sum > 0) {
		sum = sum * 1.2;
		cout << sum;
    }


 	return 0;
}