#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define all(x) x.begin(),x.end()
#define ar array
#define sz(x) ((int)x.size())
template <class T,class S> inline bool chmin(T &a,const S &b) {return (a> b? a= b, 1: 0);}
template <class T,class S> inline bool chmax(T &a,const S &b) {return (a< b? a= b, 1: 0);}
int main(){
    ios_base::sync_with_stdio(false),cin.tie(0);
    int n;
    cin >> n;
    if(n & 1){
        for(int i = 2;i <= n - 1;i += 2)
            cout << i << " ";
        cout << (n - 1) / 2 << "\n";
    }
    else{
        for(int i = 2;i <= n;i += 2)
            cout << i << " ""\n"[i == n];
    }


    return 0;
}