import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt();
		int m = scanner.nextInt();
		int c = scanner.nextInt();
		//int ary[][]= new int[n][m];
		int ans= 0;
		int b[]= new int[m];
		for(int l = 0; l<m; l++) {
			b[l]= scanner.nextInt();
		}
		for(int s=0; s<n; s++) {
			int tmp = c;
			for(int t=0; t<m; t++) {
				//ary[s][t]= scanner.nextInt();
			tmp += b[t]*scanner.nextInt(); 
			}
			if(tmp>0)ans++;
			
		}
		System.out.println(ans);
	}

}
/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