public static void main ( String [ ] args ) {
  InputReader in = new InputReader ( System . in ) ;
  int n = in . nextInt ( ) ;
  long p = in . nextLong ( ) ;
  long k = in . nextLong ( ) ;
  Map < Long , Long > map = new HashMap < Long , Long > ( ) ;
  long ans = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    long a = in . nextLong ( ) ;
    long b = bigMod ( a , 4 , p ) - ( ( k * a ) % p ) ;
    if ( b < 0 ) {
      b += p ;
    }
    if ( map . containsKey ( b ) ) {
      long val = map . get ( b ) ;
      ans += val ;
      val ++ ;
      map . put ( b , val ) ;
    }
    else {
      map . put ( b , ( long ) 1 ) ;
    }
  }
  System . out . println ( ans ) ;
  System . exit ( 0 ) ;
}

public static void main ( String [ ] args ) { InputReader in = new InputReader ( System . in ) ; int n = in . nextInt ( ) ; long p = in . nextLong ( ) ; long k = in . nextLong ( ) ; Map < Long , Long > map = new HashMap < Long , Long > ( ) ; long ans = 0 ; for ( int i = 0 ; i < n ; i ++ ) { long a = in . nextLong ( ) ; long b = bigMod ( a , 4 , p ) - ( ( k * a ) % p ) ; if ( b < 0 ) { b += p ; } if ( map . containsKey ( b ) ) { long val = map . get ( b ) ; ans += val ; val ++ ; map . put ( b , val ) ; } else { map . put ( b , ( long ) 1 ) ; } } System . out . println ( ans ) ; System . exit ( 0 ) ; }
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