test

#include <iostream>

void main()
{
    int n = 9, m = 6;

    int Du = 1;
    int Thuong = 1;
    int k = 0;
    for ( int i = 1; i <= n; i++)
    {
        Thuong = Du * i /m;
        Du = (Du * i ) % m;

        if ( Du == 0)
        {
            k++;
            Du = Thuong;
        }

    }
    std::cout << k;
}