# -*- coding: utf-8 -*-
"""
Created on Tue Apr 10 23:10:48 2018
@author: wdf
"""
m = 300# //每月的收入
flag = True#判断是否超支
h = 0
s = 0
for i in range(1,13):
a = int(input())#输入
h += m#领工资
if (h < a): #超支直接结束程序
print -i
flag = False
break
left = h - a#存钱前本月余钱
h = left % 100#存钱后本月余钱
s += left - h#增加存款
if (flag):
print(int( s * 1.2 + h))