#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	for (int i=1;i<=n;i=i+3){
		cout<<i<<endl;
	}
}
/**************************************************************
	Problem: 1713
	User: xiaojingxuan
	Language: C++
	Result: Accepted
	Time:17 ms
	Memory:2072 kb
****************************************************************/