#include<stdio.h>

int main(){
    int n;
    scanf("%d", &n);
    
    if(n >= 2) {
        printf("2");
        for(int i = 4; i <= n; i += 2) {
            printf(" %d", i);
        }
    }
    
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
// const int N=1e6+10;

signed main(){
    int _=1;
    // cin>>_;
    while (_--) {
        int n;
        cin>>n;
        for(int i=2;i<=n;i+=2) cout<<i<<" ";
    }
}