public static void main ( String [ ] args ) {
  try ( Scanner scanner = new Scanner ( System . in ) ) {
    int n = scanner . nextInt ( ) ;
    int m = scanner . nextInt ( ) ;
    int c = scanner . nextInt ( ) ;
    scanner . nextLine ( ) ;
    int b [ ] = new int [ m ] ;
    IntStream . range ( 0 , m ) . forEach ( i -> b [ i ] = scanner . nextInt ( ) ) ;
    scanner . nextLine ( ) ;
    System . out . println ( IntStream . range ( 0 , n ) . filter ( i -> {
      int sum = IntStream . range ( 0 , m ) . map ( j -> scanner . nextInt ( ) * b [ j ] ) . sum ( ) ;
      scanner . nextLine ( ) ;
      return ( sum + c ) > 0 ;
    }
    ) . count ( ) ) ;
  }
}

public static void main ( String [ ] args ) { try ( Scanner scanner = new Scanner ( System . in ) ) { int n = scanner . nextInt ( ) ; int m = scanner . nextInt ( ) ; int c = scanner . nextInt ( ) ; scanner . nextLine ( ) ; int b [ ] = new int [ m ] ; IntStream . range ( 0 , m ) . forEach ( i -> b [ i ] = scanner . nextInt ( ) ) ; scanner . nextLine ( ) ; System . out . println ( IntStream . range ( 0 , n ) . filter ( i -> { int sum = IntStream . range ( 0 , m ) . map ( j -> scanner . nextInt ( ) * b [ j ] ) . sum ( ) ; scanner . nextLine ( ) ; return ( sum + c ) > 0 ; } ) . count ( ) ) ; } }
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