#include <bits/stdc++.h>
using namespace std;
long long _mergeSort(long long arr[], long long temp[], long long left,
                     long long right);
long long merge(long long arr[], long long temp[], long long left,
                long long mid, long long right);
long long mergeSort(long long arr[], long long array_size) {
  long long temp[array_size];
  return _mergeSort(arr, temp, 0, array_size - 1);
}
long long _mergeSort(long long arr[], long long temp[], long long left,
                     long long right) {
  long long mid, inv_count = 0;
  if (right > left) {
    mid = (right + left) / 2;
    inv_count += _mergeSort(arr, temp, left, mid);
    inv_count += _mergeSort(arr, temp, mid + 1, right);
    inv_count += merge(arr, temp, left, mid + 1, right);
  }
  return inv_count;
}
long long merge(long long arr[], long long temp[], long long left,
                long long mid, long long right) {
  long long i, j, k;
  long long inv_count = 0;
  i = left;
  j = mid;
  k = left;
  while ((i <= mid - 1) && (j <= right)) {
    if (arr[i] <= arr[j]) {
      temp[k++] = arr[i++];
    } else {
      temp[k++] = arr[j++];
      inv_count = inv_count + (mid - i);
    }
  }
  while (i <= mid - 1) temp[k++] = arr[i++];
  while (j <= right) temp[k++] = arr[j++];
  for (i = left; i <= right; i++) arr[i] = temp[i];
  return inv_count;
}
int main() {
  long long n;
  cin >> n;
  long long niz[1000000];
  for (long long i = 0; i < n; i++) cin >> niz[i];
  long long bi = mergeSort(niz, n);
  if (bi % 2 == n % 2)
    cout << "Petr";
  else
    cout << "Um_nik";
}
