#include <bits/stdc++.h>
using namespace std;

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