#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: linzihang
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/