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 i = 0;i<m;i++){
      b[i] = sc.nextInt();
    }
    int[][] a = new int[n][m];
    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 code = c;
      for(int j = 0;j<m;j++){
        code += a[i][j]*b[j];
      }
      if(code>0)count++;
    }
    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