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