import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) {

		try(BufferedReader input = new BufferedReader(new InputStreamReader(System.in))){

			String[] l1 = input.readLine().split(" ");
			int N = Integer.parseInt(l1[0]);
			int M = Integer.parseInt(l1[1]);
			int C = Integer.parseInt(l1[2]);

			String[] l2 = input.readLine().split(" ");
			int[] B = new int[M];
			for(int i = 0; i < M; i++) {
				B[i] = Integer.parseInt(l2[i]);
			}

			int cnt = 0;

			for(int i=0; i < N; i++) {
				int calc = 0;
				String[] lines = input.readLine().split(" ");
				for(int j = 0; j < M; j++) {
					calc += Integer.parseInt(lines[j]) * B[j];
				}
				if(calc + C > 0) cnt++;
			}

			System.out.println(cnt);

		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

/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