#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2")
#include <bits/stdc++.h>
#define INF 1000000001LL
#define LNF 1000000000000000001LL
#define MOD 1000000007LL
#define MAX 200000
#define long long long
#define all(x) x.begin(),x.end()
using namespace std;


int main()
{
	ios_base::sync_with_stdio(0); 
    cin.tie(0);

    string s = "NUPC";
    
    vector<string> res;
    for(int i = 0; i<16;i++)
    {
        string t;
        
        for(int j = 0; j<4; j++)
        {
            t.push_back(s[j]);

            if(i&(1<<j))
                t = t+t;
        }
        res.push_back(t);
    }

    sort(all(res));

    int n;
    cin >> n;
    cout << res[n-1] << endl;

    return 0;
}