#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	int n;
	cin >> n;
	if(n == 1 || n == 2) {
		cout << 1 << endl;
	}
	else if(n % 2 == 0) {
		cout << n / 2 << endl;
	}
	else {
		cout << n << endl;
	}
}