#include <bits/stdc++.h>
using namespace std;
int main() {
  std::ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int n;
  cin >> n;
  int a[n + 2];
  int pos[n + 2];
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
    pos[a[i]] = i;
  }
  int swap = 0;
  for (int i = 1; i <= n; i++) {
    int p = pos[i];
    if (p == i) continue;
    int prev = a[i];
    a[i] = i;
    pos[prev] = p;
    a[p] = prev;
    pos[i] = i;
    swap++;
  }
  if (n % 2) {
    if (swap % 2) {
      cout << "Petr\n";
    } else {
      cout << "Um_nik\n";
    }
  } else {
    if (swap % 2) {
      cout << "Um_nik\n";
    } else {
      cout << "Petr\n";
    }
  }
  return 0;
}
