#include <bits/stdc++.h>
using namespace std;
const int MAX = 1e6 + 2;
int pos[MAX], a[MAX];
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int n, c = 0, k;
  cin >> n;
  for (int i = 1; i < n + 1; i++) cin >> k, a[k] = i, pos[i] = k;
  for (int i = 1; i < n + 1; i++) {
    if (pos[i] != i) {
      c++;
      int j = pos[i];
      int k = a[i];
      pos[k] = j;
      a[j] = k;
      a[i] = i;
      pos[i] = i;
    }
  }
  if ((3 * n + c) & 1)
    cout << "Um_nik";
  else
    cout << "Petr";
}
