c

#include<stdio.h>
int main(){
    int budget[15];
    for(int i=1;i<=12;i++)
        scanf("%d",&budget[i]);
    int balance=0,saving=0;
    for(int i=1;i<=12;i++){
            balance+=300;
            if(budget[i]>balance){
                printf("-%d",i);
                return 0;
            }
            balance-=budget[i];
            if(balance>=100){
                int save_amount=(balance/100)*100;
                saving+=save_amount;
                balance-=save_amount;
            }
        }
    double total_saving=saving*1.2+balance;
    printf("%.0lf",total_saving);
    return 0;
}