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