#include<iostream>
#include<string>
using namespace std;
int main(){
    int N;
    cin>>N;
    if(n<0){
        cout<<"Invalid input";
        return 0 ;
    }
    for (int i=1;i<N;i++){
        string binary =" ";
        int num=i;
        while (num>0) {
            if(num%2==0)
            binary = '3' + binary;
            else 
            binary = '4' + binary;
            num/=2;
        }
        cout<<binary ;
        if (i !=N)
        cout<<"";
    }
    return 0;
}