#include <iostream>
#include <functional>

using namespace std;

int testPlus(int a) { return a + 1; }
int testMinus(int a) { return a - 1; }

int main() {
	int value; cin>>value;
	
	function<int(int)> f = value==1? testPlus : testMinus;
	
	cout << f(3) << endl;
	
	return 0;
}