import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scn = new Scanner(System.in);
		int n = scn.nextInt();
		int m = scn.nextInt();
		long ans = 0;
		int c = scn.nextInt();
		int count = 0;
		int[]b = new int[m];
		for(int i = 0;i<m;i++) {
			b[i]=scn.nextInt();
		}
		for(int i = 0;i<n;i++) {
			ans= c;
			for(int j = 0;j<m;j++) {
				ans+=b[j]*scn.nextInt();
			}
			if(0<ans)count++;
		}
		System.out.println(count);
		scn.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