#include <iostream>
#include <ctime>
using std::cin;
using std::cout;
using std::endl;

template <int x> struct Factorial {
    static const unsigned long long value = x * Factorial<x - 1>::value;
};

template <> struct Factorial<0> {
    static const unsigned long long value = 1;
};

std::ostream &f(std::ostream &out) {
    out << "hhh";
    return out;
}

int main() {
    cout << "test" << f << endl;
    const std::function<const int(const int)> &func([](const int a) { return a + 1;});
    const std::function<const int(const int)> &func2 = func;
    cout << -20 / 20 << endl;
    std::string aString;
    cin >> aString;
    cout << aString << endl;
    return 0;
}