#include<bits/stdc++.h>
using namespace std;
string S="NUPC";
vector<string>NUPC;
void dfs(int i, string s)
{
    if(i==4)NUPC.push_back(s);
    else
    {
        s.push_back(S[i]);
        dfs(i+1,s+"1");
        dfs(i+1,s+"2");
    }
}
string expand(string& s)
{
    assert(s.size()==8);
    string T="";
    for(int i=0;i<8;i++)
    {
        if(i&1)
        {
            if(s[i]=='2')T=T+T;
        }
        else T.push_back(s[i]);
    }
    return T;
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    dfs(0,"");
    for(string&s:NUPC)s=expand(s);
    sort(NUPC.begin(),NUPC.end());
    int K;
    cin>>K;
    cout<<NUPC[K-1]<<endl;
}