// editor1
#include <iostream>
#include <queue>
using namespace std;
int main()
{
    int N;
    cin>>N;
    if(N < 0)
    {
        cout<<"Invalid input";
        return 0;
    }
    queue<string>q;
    q.pudh('3');
    q.push('4');
    for(int i =1; i<= N ; i++)
    {
        string curr = q.front();
        q.pop();
    cout<<curr;
    q.push(curr+"3");
    q.push(curr+"4");
    }
}