Lovely Doll

#include<fstream>
#include<iostream>
using namespace std;

int main()
{
    ifstream fi("SHOP.INP");
    ofstream fo("SHOP.OUT");
    int i, n, k, total = 0;
    fi>>n>>k;
    int a[n];
    for(i=0;i<n;i++)
        fi>>a[i];
    for(i=0;i<n;i++)
        if(!(i%(n/k)))
            total += a[i];
    fo<<"Gia tien "<<total<<endl;
    cout<<total<<endl;
    fi.close();
    fo.close();
}