
import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int M = sc.nextInt();
        int O = sc.nextInt();
        
        int[] L = new int[M];
        
        for(int i = 0 ; i < M ;i++) {
        	L[i] = sc.nextInt();
        }
        int count = 0;
        int judge = O;
        
        for(int i = 0 ; i < N ;i++) {
        	for(int m = 0 ; m < M;m++) {
        		judge += sc.nextInt()*L[m];
        	}
        	if(judge > 0) {
        		count++;
        	}
        		judge = O;
        	
        }
        System.out.println(count);
    }
}
/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