using System;


public class Hello
{
    static void Main()
    {
        var k = int.Parse(Console.ReadLine().Trim());
        getAns(k);
    }
    static string make(string t)
    {
        var res = "";
        foreach (var x in t)
        {
            if (x == '1') continue;
            else if (x == '2') res += res;
            else res += x;
        }
        return res;
    }
    static void getAns(int k)
    {
        var q = new Queue<string>();
        var a = new List<string>();
        q.Enqueue("");
        while (q.Count > 0)
        {
            var w = q.Dequeue();
            var n = w.Length;
            if (n == 8) a.Add(w);
            else if (n == 0) { q.Enqueue(w + "N1"); q.Enqueue(w + "N2"); }
            else if (n == 2) { q.Enqueue(w + "U1"); q.Enqueue(w + "U2"); }
            else if (n == 4) { q.Enqueue(w + "P1"); q.Enqueue(w + "P2"); }
            else if (n == 6) { q.Enqueue(w + "C1"); q.Enqueue(w + "C2"); }
        }
        var b = new List<string>();
        foreach (var x in a) b.Add(make(x));
        b.Sort();
        Console.WriteLine(b[k - 1]);
    }
}