public static void main ( String [ ] args ) {
  FastScanner scanner = new FastScanner ( ) ;
  PrintWriter out = new PrintWriter ( System . out ) ;
  int N = scanner . nextInt ( ) ;
  int [ ] perm = new int [ N ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) perm [ i ] = scanner . nextInt ( ) ;
  int swaps = 0 ;
  boolean [ ] vis = new boolean [ N ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    int j = i , cycle = 0 ;
    while ( ! vis [ j ] ) {
      vis [ j ] = true ;
      j = perm [ j ] - 1 ;
      cycle ++ ;
    }
    if ( cycle > 0 ) swaps += cycle - 1 ;
  }
  if ( swaps % 2 != N % 2 ) out . println ( "Um_nik" ) ;
  else out . println ( "Petr" ) ;
  out . flush ( ) ;
}

public static void main ( String [ ] args ) { FastScanner scanner = new FastScanner ( ) ; PrintWriter out = new PrintWriter ( System . out ) ; int N = scanner . nextInt ( ) ; int [ ] perm = new int [ N ] ; for ( int i = 0 ; i < N ; i ++ ) perm [ i ] = scanner . nextInt ( ) ; int swaps = 0 ; boolean [ ] vis = new boolean [ N ] ; for ( int i = 0 ; i < N ; i ++ ) { int j = i , cycle = 0 ; while ( ! vis [ j ] ) { vis [ j ] = true ; j = perm [ j ] - 1 ; cycle ++ ; } if ( cycle > 0 ) swaps += cycle - 1 ; } if ( swaps % 2 != N % 2 ) out . println ( " Um _ nik " ) ; else out . println ( " Petr " ) ; out . flush ( ) ; }
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