#include<stdio.h>
int main()
{
    unsigned int a[12], month = 1, b = 300, leave;
    for(int i = 0; i <12; i++)
    {
        scanf("%d", &a[i]);
    }
    leave = b - a[0];
    for(int i =1 ; i < 12; i++)
    {
        leave=b+leave;
        if(leave >= a[i])
        {
            leave = leave- a[i];
            if(leave / 100 != 0)
            {
                leave = leave%100;
                
            }
			month++;
        }
        else
        {
            printf("%d", -(month+1));
            return 0;
        }
    }
    printf("%d", (1200*1.2 + leave));
    return 0;
}