import java.util.*;

public class Main{
	public static void main(String[] args) throws Exception {
		Scanner s = new Scanner(System.in);
		int N = s.nextInt(), M = s.nextInt(), C = s.nextInt(), m = 0, n = 0;
		int[] B = new int [M], A = new int [M];
		for (int i = 0; i < M; i++) B[i] = s.nextInt();
		for (int j = 0; j < N; j++){
			m = 0;
			for (int k = 0; k < M; k++){
				A[k] = s.nextInt();
				m += A[k] * B[k];
			}
			if (m + C > 0) n++;
		}
		System.out.println(n);
	}
}

/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