#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: hongjiaming
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/