#include <bits/stdc++.h>
using namespace std;
int main()
{
	int yusuan , ew , cun = 0 , shengyu = 0 , H , shouyou = 0 , a;
	
	
	for(int i = 1 ; i <= 12 ; i++)
	{
		cin >> yusuan ; //每月的预算 
		
		ew = (300 - yusuan) / 100 ;       //存储的钱 
		shouyou = shengyu + 300 - (ew * 100);	     //计算存储后拥有的钱 
		
		
		
		shengyu = shouyou - yusuan;       //使用后剩余的钱 
		a = shengyu / 100; 
		shengyu = shengyu - a * 100;     //满一百存钱 
		
		if(yusuan > shouyou) 
		{
			cout << -i << endl;
			return 0;
		}                                //判断是否超额 
		
		if(ew != 0)
		{
			cun = cun + (ew * 100);
			if(a != 0 )
			cun = cun + a * 100;
		}                                 //每月存储 
		
		
	}
	H = cun * 1.2 + shengyu + shouyou;
	
	cout << H << endl;
	
	
	
	return 0;
}