#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;
}