#include <bits/stdc++.h>

using namespace std;

#define endl "\n";

int main() {
	
	long long n;
	cin >> n;
	long long dem = 0;
	
	for (int i = 1; i <= n; i++) {
		if (i % 2 == 0) {
			cout << i << " ";
		}
	}
	cout << endl;
	
	return 0;
	
}