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