#include <cstdlib>
#include <cctype>
#include <cstring>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <vector>
#include <string>
#include <iostream>
#include <sstream>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <fstream>
#include <numeric>
#include <iomanip>
#include <bitset>
#include <list>
#include <stdexcept>
#include <functional>
#include <utility>
#include <ctime>
#include <cassert>
using namespace std;
typedef long long LL;
typedef unsigned long long ULL;
#define MEM(a,b) memset((a),(b),sizeof(a))
const LL INF = 1e9 + 7;
const int N = 1e6 + 10;
int a[N];
int main()
{
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);
	int n;
	while (scanf("%d", &n) != EOF)
	{
		if (n == 0) break;
		a[1] = 1;
		for (int i = 2; i <= n; i++)
		{
			a[i] = i;
			if (i & 1) swap(a[i], a[i - 2]);
			else swap(a[i], a[i - 1]);
		}
		for (int i = 1; i <= n; i++)
			printf("%d%c", a[i], " \n"[i == n]);
	}
	return 0;
}