#include <bits/stdc++.h>
 using namespace std;  
  int main(){
    long long n;
    Cin>>n;
    
    string s="";
    
   while (n>0){   
       if(n%2==0){
           s+="4";
    n=n/2-1;
   }else{
       s+="3";
     n=n/2;
          }
          }
       reverse(s.begin(),s.end());
       cout<<s;
  }