
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.next());
        int m = Integer.parseInt(sc.next());
        int c = Integer.parseInt(sc.next());
        int[] b = new int[m];
        int[][] a = new int[n][m];
        for(int i=0;i<m;i++)b[i] = Integer.parseInt(sc.next());
        for(int i=0;i<n;i++){
            for(int j=0;j<m;j++){
                a[i][j] = Integer.parseInt(sc.next());
            }
        }
        int res = 0;
        int sum;
        for(int i=0;i<n;i++){
            sum =0;
            for(int j=0;j<m;j++){
                sum+=a[i][j]*b[j];
            }
            if(sum+c > 0){
                res++;
            }
        }
        System.out.println(res);
        sc.close();
    }
    
}
/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