import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// 初期化
		Scanner sc = new Scanner(System.in);
		String[] data = sc.nextLine().split(" ");
		int N = Integer.parseInt(data[0]);
		int M = Integer.parseInt(data[1]);
		int C = Integer.parseInt(data[2]);
		String[] B = sc.nextLine().split(" ");
		int value=0;
		int result=0;
		String line = "";
		
		for(int i=0;i<N;i++) {
			value=0;
			String[] A = sc.nextLine().split(" ");
			for(int j=0;j<M;j++) {
				value += Integer.parseInt(A[j]) * Integer.parseInt(B[j]);
			}
			if(value + C > 0) result++;
		}
		System.out.println(result);
	}
}

/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