#include<bits/stdc++.h>
using namespace std;
int main(){
	int a;
	cin>>a;
	for(int i=1;i<=a;i=i+3){
		cout<<i<<endl;
		
	}

} 
/**************************************************************
	Problem: 1713
	User: zhengzihao
	Language: C++
	Result: Accepted
	Time:20 ms
	Memory:2072 kb
****************************************************************/