#include <iostream>
using namespace std;
int main ()
{
    string s;
    long long unsigned int n,g,g7;
    cin>>n;
    g=n/7;
    g7=g*7;
    cout<<n-g7<<endl;
    return 0;
}

Edited by author 21.03.2009 15:00

Edited by author 21.03.2009 17:11

Thank you!!!Now I got AC