#include <iostream>
#include <cmath>

int main()
{
        constexpr double pi1 = 3.1415926535897932;
        constexpr double pi2 = 2.0*acos(0.0);

        std::cout << "Compare: " << (pi1 == pi2 ? "OK" : "NG") << std::endl;

        return 0;
}