import java.util.Scanner;
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];
    int[][] A = new int[N][M];
    for(int i=0; i<M; i++){
      B[i] = sc.nextInt();
    }
    for(int i=0; i<N; i++){
      for(int j=0; j<M; j++){
        A[i][j] = sc.nextInt();
      }
    }
    int count = 0;
    for(int i=0; i<N; i++){
      int wa = C;
      for(int j=0; j<M; j++){
        wa += B[j] * A[i][j];
      }
      if(wa > 0){
        count++;
      }
    }
    System.out.print(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