#include <bits/stdc++.h>
using namespace std;

vector<string> gen_compression_number_vector() {
    vector<string> res;
    for (int i = 1; i <= 2; i++) {
        for (int j = 1; j <= 2; j++) {
            for (int k = 1; k <= 2; k++) {
                for (int l = 1; l <= 2; l++) {
                    string tmp = "";
                    tmp.push_back(i + '0');
                    tmp.push_back(j + '0');
                    tmp.push_back(k + '0');
                    tmp.push_back(l + '0');
                    res.push_back(tmp);
                }
            }
        }
    }
    return res;
}

string decompress(string compression_number) {
    string nupc = "NUPC";

    string tmp_decompressed = "";
    for (int i = 0; i < 4; i++) {
        tmp_decompressed.push_back(nupc[i]);
        if (compression_number[i] == '2') {
            tmp_decompressed += tmp_decompressed;
        }
    }

    return tmp_decompressed;
}

int main() {
    int K;
    cin >> K;

    vector<string> compression_numbers = gen_compression_number_vector();

    vector<string> decompressed;
    for (auto&& s : compression_numbers) {
        string tmp = decompress(s);
        decompressed.push_back(tmp);
    }

    sort(decompressed.begin(), decompressed.end());

    cout << decompressed[K - 1] << endl;
}