import java.util.Scanner;
import java.util.ArrayList;
import java.util.Collections;

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 cnt = 0;
    int total = 0;

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

    for (int i = 0; i < N; i++) {
      total = 0;
      for (int j = 0; j < M; j++) {
        total += A[j] * sc.nextInt();
      }
      if (total + C > 0) {
        cnt++;
      }
    }
    System.out.println(cnt);
  }
}

/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