import java.util.Scanner;

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 B[] = new int[M];
		for (int i=0;i<M;i++) {
			B[i] = sc.nextInt();
		}
		int count =0;
		for (int i=0;i<N;i++) {
			int temp =0;
			for (int j=0;j<M;j++) {
				int t = sc.nextInt();
				temp +=t*B[j];
			}
			if (temp+C>0) {
				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