public class CallingCircle {

  // Data: conversations[i][j] == 1 if i has a conversation with j.
  // It's zero otherwise.
  
  static int findNumCallingCircles (int[][] conversations)
  {
    // INSERT YOUR CODE HERE.
      return -1;
  }


  //----------------------------------------------------------------
  // Test code ...
  

  public static void main (String[] argv) 
  {
    int[][] A1 = {
      {0, 0, 1, 0, 1},
      {0, 0, 0, 1, 0},
      {1, 0, 0, 0, 1},
      {0, 1, 0, 0, 0},
      {1, 0, 1, 0, 0}
    };
    int n = findNumCallingCircles (A1);
    System.out.println ("Test 1: 2 calling circles, your answer: " + n);

    int[][] A2 = {
      {0, 0, 1, 1, 1},
      {0, 0, 0, 1, 0},
      {1, 0, 0, 0, 1},
      {1, 1, 0, 0, 1},
      {1, 0, 1, 1, 0}
    };
    n = findNumCallingCircles (A2);
    System.out.println ("Test 2: 1 calling circle, your answer: " + n);

  }

}