import java.util.*;
import java.math.RoundingMode;
import java.math.BigDecimal;
 
 
 
public class Main{
	 public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		int c = sc.nextInt();
		int b[] = new int[m];
		for(int i = 0; i < m; i++) {
			b[i] = sc.nextInt();
		}
		int a[][] = new int[n][m];
		for(int i = 0; i < n; i++) {
			for(int j = 0; j < m; j++) {
				a[i][j] = sc.nextInt();
			}
		}
		int ans = 0;
		for(int i = 0; i < n; i++) {
			int val = 0;
			for(int j = 0; j < m; j++) {
				val += a[i][j]*b[j];	
			}
			if (val+c>0) ans++;
			else continue;
		}
		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