import java.util.Scanner;


public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = Integer.parseInt(sc.next());
		int m = Integer.parseInt(sc.next());
		int c = Integer.parseInt(sc.next());
		int[] b = new int[m];
		for(int i=0;i<m;i++) {
			b[i]=Integer.parseInt(sc.next());
		}
		int count=0;
		for(int i=0;i<n;i++) {
			int total=c;
			for(int j=0;j<m;j++) {
				total+=b[j]*Integer.parseInt(sc.next());
			}
			if(total>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