哪里不对？

#include <iostream>
using namespace std;
int main()
{
    int ming=0,ma=0;
    for (int i=1;i<=12;i++)
    {
        int p;
        cin>>p;
        ming+=300;
        if (ming<p)
        {
            cout<<"-"<<i<<endl;
            return 0;
        }
        if (ming-p>=100)
        {
            ma+=(ming-p)/100;
            ming-=(ming-p)/100;
            ming-=p;
        }
    }
    cout<<ming+ma*120.0/12<<endl;
    return 0;
}