#include<iostream>
#include<math.h>

using namespace std;

int main()
{
    int result = 0;
    int iTest;
    while(cin >> iTest)
    {
        if(iTest == 0)
        {
            break;
        }
        result = floor(iTest/2);
        cout << result <<endl;
    }
    return 0;
}