public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int N = sc . nextInt ( ) ;
  int M = sc . nextInt ( ) ;
  int C = sc . nextInt ( ) ;
  int res = 0 ;
  int [ ] B = new int [ M ] ;
  int [ ] A = new int [ M ] ;
  for ( int i = 0 ;
  i < M ;
  i ++ ) {
    B [ i ] = sc . nextInt ( ) ;
  }
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    int sum = C ;
    for ( int n = 0 ;
    n < M ;
    n ++ ) {
      A [ n ] = sc . nextInt ( ) ;
    }
    for ( int n = 0 ;
    n < M ;
    n ++ ) {
      sum += A [ n ] * B [ n ] ;
    }
    if ( sum > 0 ) {
      res ++ ;
    }
  }
  System . out . println ( res ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int N = sc . nextInt ( ) ; int M = sc . nextInt ( ) ; int C = sc . nextInt ( ) ; int res = 0 ; int [ ] B = new int [ M ] ; int [ ] A = new int [ M ] ; for ( int i = 0 ; i < M ; i ++ ) { B [ i ] = sc . nextInt ( ) ; } for ( int i = 0 ; i < N ; i ++ ) { int sum = C ; for ( int n = 0 ; n < M ; n ++ ) { A [ n ] = sc . nextInt ( ) ; } for ( int n = 0 ; n < M ; n ++ ) { sum += A [ n ] * B [ n ] ; } if ( sum > 0 ) { res ++ ; } } System . out . println ( res ) ; }
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