#include<bits/stdc++.h>
using namespace std;
int main(){
    int i,n;
    cin>>n;
    for(i = 1;i <= n;i = i + 3){
        cout<<i<<endl;
    }
} 
 
/**************************************************************
	Problem: 1713
	User: wangyiyang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/