#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;
}