import java.util.Scanner;

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 cnt = 0;


        for (int i = 0; i < N; i++) {
            int sum = C;
            for (int j = 0; j < M; j++) {
                sum += A[i][j] * B[j];
            }
            if (sum > 0) {
                cnt++;
            }
        }

        System.out.println(cnt);

    }
}

/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