#include <random>
#include <iostream>
 
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_int_distribution<> dis(1, 16);
 
 	int number = 0;
    while (number != 2 && number != 4 && number != 6)
    {
       number =  dis(gen);
    }
    std::cout << number <<'\n';
}