int number = 0;
   int[] arr = {1,7,8,8,8,8,1,1,2,1,5,1,2,5,5,5,5,5,};
   bool containsNumber = false;
   List<int> existingElements = new List<int>();
     
   for(int i = 0; i < arr.Length; i++)
   {
    for(int j = 0; j < existingElements.Count; j++){
      if(arr[i] == existingElements[j]) {
            containsNumber = true;
            break;
         }
    }
     
     
     if(containsNumber)
     {
       containsNumber = false;
       continue;
     }
       
     for(int k = 0; k < arr.Length; k++)
      {
        if(arr[i] == arr[k])
        {
            number++;
        }

      }
     existingElements.Add(arr[i]);
     Console.WriteLine ("The number "+ arr[i] +" appears "+ number +" Times");
     number = 0;
     
   }