import java.util.*;

public class Main{
	static public void  main(String[] args){
		Scanner scan = new Scanner(System.in);

		int N = scan.nextInt();
		int M = scan.nextInt();
		int C = scan.nextInt();

		int[] b = new int[M];
		int[][] a = new int[N][M];

		for(int i = 0; i < M;i++){
			b[i] = scan.nextInt();
		}
		int ret = 0;
		for(int i = 0; i < N;i++){
			int sum = C;
			for(int j = 0; j < M;j++){
				sum += b[j] * scan.nextInt();
			}
			if(sum > 0) ret++;
		}
		System.out.println(ret);
	}
}

/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