import java.util.Scanner;


public class Main {


	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ


		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int M = sc.nextInt();
		int C = sc.nextInt();
		int res = 0;
		int[] B =new int[M] ;
		int[] A = new int[M];
		for(int i=0;i<M;i++) {
			B[i] = sc.nextInt();
		}
		for(int i = 0;i<N;i++) {
			int sum = C;
			for(int n = 0;n<M;n++) {
				A[n]=sc.nextInt();
			}
			for(int n = 0;n<M;n++) {
				sum += A[n]*B[n];
			}
			if(sum>0) {
				res++;
			}
		}
		System.out.println(res);
	}
}	
/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