массивы 1.2

#include<iostream>
#include<cmath>
#include<fstream>
using namespace std;
int main()
{
    ifstream in("input.txt");
    ofstream out("output.txt");
    int a[100];
    int n,m=0;
    float sum=0;
    in >> n;
    for (int i = 0; i < n;i++)
    {
        {in >> a[i];
        if (a[i] < 0) {

            sum += a[i];
            m++;
        }
        }

    }
    sum /= m;
    out << sum<< endl;
    in.close();
    out.close();
    system("pause");
    return 0;
}