import java.util.Scanner;
public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int[] d = new int[b];
        int[][] e = new int[a][b];
        int[] sum = new int[a];
        int count = 0;
        for (int i = 0; i < b; i++) {
            d[i] = sc.nextInt();
        }
        for (int j = 0; j < a; j++) {
            for (int i = 0; i < b; i++) {
                e[j][i] = sc.nextInt();
                sum[j] += e[j][i] * d[i];
            }
            if (sum[j] + c > 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