# include <stdio.h>

int main(){

    int m[12];
    int i,j;
    int money=0;
    int savemoney,leftmoney;
    int wholemoney;
    int flag=1;
    for(i=0;i<12;i++){
        scanf("%d",&m[i]);
    }
    for(i=0;i<12;i++){
        money+=300-m[i];
        if(money>=0){
            savemoney+=money/100*100;
            leftmoney=money-money/100*100;
            money=leftmoney;
        }else{
            printf("-%d\n",i+1);
            flag=0;
            break; 
        }
    }
    if(flag){
	    wholemoney=savemoney*1.2+leftmoney;
	    printf("%d",wholemoney);
	}
}