import java.util.*;

public class Main{
    public static 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];
        for(int i = 0; i < m; i++) b[i] = scan.nextInt();
        int[][] a = new int[n][m];
        for(int i = 0; i < n; i++) for(int j = 0; j < m; j++) a[i][j] = scan.nextInt();
        int out = 0;
        for(int i = 0; i < n; i++){
            int sum = 0;
            for(int j = 0; j < m; j++){
                sum += a[i][j] * b[j];
            }
            sum += c;
            if(sum > 0) out++;
        }
        System.out.println(out);
        scan.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