求求了！！

#include<iostream>
using namespace std;
int a[12];
int main(){
    int jjnow=0,x=0,b,mm=0;
    for(int i=1;i<=12;i++){
    	cin>>a[i];
	}
	for(int i = 1;i<=12;i++){
		jjnow+=300;
		jjnow-=a[i];
		if (jjnow < 0){
			cout<<"-"<<i<<endl;
			return 0;
		}
		else{
			if(jjnow>=100) {
				b=jjnow/100*100;
				jjnow-=b;
				mm+=b;
			}
		}	
	}
	cout<<jjnow+mm*1.2<<endl;
    return 0;
}