import java.util.*;

public class Main {

  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[][] A = new int[N][M];
    int[] B = new int[M];

    for (int i = 0; i < M; i++) {
      B[i] = sc.nextInt();
    }

    for (int i = 0; i < N; i++) {
      for (int j = 0; j < M; j++) {
        A[i][j] = sc.nextInt();
      }
    }

    sc.close();

    int count = 0;

    for (int i = 0; i < N; i++) {
      int sum = C;
      for (int j = 0; j < M; j++) {
        sum += A[i][j] * B[j]; 
      }
      if (0 < sum) {
        count++;
      }
    }
    

    System.out.println(count);

  }

}
/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