#include <stdio.h>

int main(){

int exp[12];
int m=300,star=0;
int i=0;
for(;i<12;i++){
	scanf("%d",&exp[i]);
}
int sum=0;
for(i=0;i<12;i++){
	if(star+m<exp[i]){
		printf("%d",-(i+1));break;
	}
	else{
		star=(star+m-exp[i])%100;
		sum=(star+m-exp[i])/100*100;
	}	
}
if(i==11)
printf("%d",(int)(sum*1.2));
return 0;
}```c