#include <bits/stdc++.h>

using namespace std;

#define _ std::ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define endl '\n'
#define dgb(x) cout << #x << " = " << x << endl;
#define ll long long
#define uint unsigned int
#define MP make_pair
#define PB push_back
#define pii pair<int, int>

const int INF = 0x3f3f3f3f;
const ll LINF = 0x3f3f3f3f3f3f3f3fll;

int main (void) {_
    int n;
    vector<int> permutacao;

    while (cin >> n && n) {
        permutacao = vector<int>(n+1);

        permutacao[1] = 1;
        iota(permutacao.begin()+2, permutacao.end(), 2);

        for (int i = 2; i <= n; i++) {
            if (i & 1) swap(permutacao[i], permutacao[i-2]);
            else swap(permutacao[i], permutacao[i-1]);
        }

        cout << permutacao[1] ;
        for (int i = 2; i <= n; i++) cout << ' ' << permutacao[i];
        cout << endl;

    }

    return 0;
}