import java.util.*;
import java.io.*;

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 ans = 0;
        for (int i = 0; i < n; i++) {
            int tmp = 0;
            for (int j = 0; j < m; j++) {
                tmp += sc.nextInt() * b[j];
            }
            if (tmp + c > 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