#include<iostream>
using namespace std;

int main() {
	int i,n;
	cin>>n;
	for(i = 1;i <= n;i = i + 3){
		cout<<i<<endl;
	}
}
/**************************************************************
	Problem: 1713
	User: admin
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/