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#include<iostream>
#include<stdio.h>
using namespace std;
int main() {
int i,month,left=0,save=0,sum,plan,flag=0;
for(month=1; month<=12; month++) {
left+=300;
scanf("%d",&plan);
left = left - plan;
if(left<0) {
flag=1;
break;
} else {
i = left/100;
save += (100*i);
left -= (100*i);
}
}
if(flag>0)
printf("-%d",month);
else {
sum=((1.2*save) + left);
printf("%d",sum);
}
return 0;
}