import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int M = sc.nextInt();
    int C = sc.nextInt();
    int B[] = new int[M];
    for(int j=0; j<M; j++){
      B[j] = sc.nextInt();
    }
    int r=0;
    for(int i=0; i<N; i++){
      int s=C;
      for(int b: B){
        int a = sc.nextInt();
        s += a*b;
      }
      if(s>0){
        r++;
      }
    }
    System.out.println(r);
  }
}
/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