#include <iostream>

using namespace std;

void print() {
	cout << "hello world" << endl;
}

template<class T>
void print(T a) {
	cout << a << endl;
}

template<class T, class ...arg>
void print(const T& a, const arg&... b) {
	cout << a << ", ";
	print(b...);
}

int main()
{
	print();
	print(1);
	print(1, 2);
	print(1, 2, 3);
	print(1, 2, 3, 4);
	print(1, 2, 3, 4, 5);
}