import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    try (Scanner sc = new Scanner(System.in);) {
      int N = sc.nextInt();
      int M = sc.nextInt();
      int C = sc.nextInt();
      sc.nextLine();

      int[] BArray = new int[M];
      int answer = 0;
      for (int i = 0; i < BArray.length; i++) {
        BArray[i] = sc.nextInt();
      }
      sc.nextLine();
      for (int i = 0; i < N; i++) {
        int result = 0;
        for (int j = 0; j < M; j++) {
          result += sc.nextInt() * BArray[j];
        }
        if (0 < (result + C)) {
          answer++;
        }
        sc.nextLine();
      }

      System.out.println(answer);
    }
  }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz