#include <iostream>
#include <cstdlib>
using namespace std;

void f0();
void f1();
void f2();
void f3();

int main()
{
	int i;   //uninitialized variable
	cin >> i;

	if (i == 0) {
		f0();
	} else if (i == 1) {
		f1();
	} else if (i == 2) {
		f2();
	} else if (i == 3) {
		f3();
	} else {
		cerr << "input " << i
			<< " must be in the range 0 to 3 inclusive\n";
		return EXIT_FAILURE;
	}

	return EXIT_SUCCESS;
}