#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<long long> vl;

int main() {
    int N;
    cin >> N;
    if (N % 2 != 0) {
        N++;
    }

    for (int i = 1; i <= N; i += 2) {
        cout << i;
        if (i != (N - 1) || (i != N)) {
            cout << " ";
        }
    }
    cout << endl;
}