#include <bits/stdc++.h>

int main() { int a; std::cin >> a; for (int c = 1; c <= a; ++c) { if (c % 2 == 1) { std::cout << c + 1; } else { std::cout << c - 1; } if (c != a) std::cout << " "; } std::cout << std::endl; return 0; }