#include<bits/stdc++.h>
using namespace std;
int main() {
    int n,i;
    cin>>n;
    for(i=1;i<=n;i+=3){
        cout<<i<<endl;
    }
}
/**************************************************************
	Problem: 1713
	User: linmiaoling
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/