#include <bits/stdc++.h>
#ifdef LOCAL
#include "./debug.cpp"
#else
#define debug(...)
#define print_line
#endif
using namespace std;
using ll = long long;

int main() {
    string S = "NUPC";

    auto convert = [](string s) {
        string ret;
        for (int i = 0; i < 8; i++) {
            if (i % 2 == 0) {
                ret += s[i];
            } else if (s[i] == '2') {
                ret += ret;
            }
        }
        return ret;
    };

    vector<string> str;

    auto F = [&](auto&& F, string s) -> void {
        if (s.size() == 8) {
            str.push_back(s);
            return;
        }
        int sz = s.size();
        if (sz % 2 == 0) {
            s += S[sz / 2];
            F(F, s);
        } else {
            s += '1';
            F(F, s);
            s.pop_back();
            s += '2';
            F(F, s);
        }
    };

    F(F, "");

    for (auto& s : str) {
        s = convert(s);
    }

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

    int K;
    cin >> K;
    K--;
    cout << str[K] << endl;
}