#include<bits/stdc++.h>
using namespace std;
int main() {//输出满足条件的整数3
	int n;
	cin >> n;
	//可以发现题中规律就是输出公差为3的等差数列，也就是说循环间隔是3
	for (int i = 1; i <= n; i += 3) {
		cout << i << endl;
	}
	
}

#include<iostream>
using namespace std;
int main(){
    int n;
    cin>>n;
    for(int i=1;i<=n;i+=3){
        cout<<i<<endl;
    }
    return 0;
}