import java.util.Scanner;

class Main{

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);			//文字の入力
		int N = sc.nextInt();
		int M = sc.nextInt();
		int C = sc.nextInt();
		int ans = 0;
		
		int[] B = new int[M];
		for(int i = 0;i < M;i++){
			B[i] = sc.nextInt();
		}
		for(int i = 0;i < N;i++){
			int sum = 0;
			for(int j = 0;j < M;j++){
				sum += sc.nextInt() * B[j];
			}
			sum += C;
			if(sum > 0){
				ans++;
			}
		}
		System.out.print(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