#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';
}
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