#include<stdio.h>
int main()
{
    int i,j,budget,remain=0,save=0,poor=0;
    for(i=1;i<=12;i++)
    {
        remain=remain+300;
        scanf("%d",&budget);
        remain=remain-budget;
        if(remain<0)
        {
            poor++;
            break;
        }
        else
        {
            j=remain/100;
            remain=remain-j*100;
            bank=save+j*100;
        }
    }
    if(save!=0)
        printf("-%d",i);
    else
        printf("%d",1.2*save+remain);
    return 0;
}