#include <cstdio>
        using namespace std;
        int main()
        {
            int n, i;
            freopen("damesah.in","r",stdin);
            freopen("damesah.out","w",stdout);
            scanf("%d",&n);
            for (i=2; i<=n; i+=2) printf("%d ",i);
            for (i=1; i<=n; i+=2) printf("%d ",i);
            fclose(stdin);
            fclose(stdout);
            return 0;
        }