wa,求助！help！

#include<bits/stdc++.h>
using namespace std;
signed main(){
    int a[100]={};
    double money=0,mommoney=0;
    for(int i=0;i<12;i++){
        cin>>a[i];
        money+=300;
        if(money<a[i]){
            cout<<-(i+1);
            return 0;
        }
        if(money-a[i]<100)continue;
        int x=(money-a[i])/100*100;
        money-=x;
        mommoney+=x;
    }
    cout<<money+mommoney*1.2;
    return 0;
}