import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int h = sc.nextInt();
		int r = sc.nextInt();
		int max = -sc.nextInt();
		int ans = 0;
		int[] row = new int[r];
		for (int i = 0; i < r; i++) {
			row[i] = sc.nextInt();
		}
		for (int i = 0; i < h; i++) {
			int sum = 0;
			for (int j = 0; j < r; j++) {
				sum = sum + sc.nextInt() * row[j];
			}
			if (sum > max) {
				ans++;
			}
		}
		System.out.println(ans);
		sc.close();
	}
}
/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