为甚魔

#include <bits/stdc++.h>
using namespace std;
struct light{
    bool light;
}a[5001];
int n,cnt = 1;
int main(){
    scanf("%d",&n);
    for(int i = 1;i<=n;i++)a[i].light = true;
    for(int i = 1;i<=n;i++){
        if(i%cnt == 0){
            if(a[i].light == true)a[i].light = false;
            else a[i].light = true;
        }
    }
    for(int i = 1;i<=n;i++)
        if(a[i].light == false)printf("%d ",i);
    return 0;
}