Line 16. I cant figure out what is wrong with this program

          int runningTotal = 0;
          bool keepGoing = true;

          while (keepGoing)
          {
            // Prompt the user for minutes exercised
          Console.Write("Enter how many minutes you exercised or type "quit" to exit: ");

            string entry = Console.ReadLine();

          if (entry == "quit")
            {
              keepGoing = false;
            }
          else 
          {

          int minutes = int.Parse(entry);

            if(minutes <=10)
            {
              Console.WriteLine("Better than nothing, right?");
            }
            else if (minutes <=30)
            {
              Console.WriteLine("Way to go hot stuff!");
            }
            else if (minutes <=60)
            {
              Console.WriteLine("You must be a ninja warrior in training!");
            }
            else (minutes >=60)
            {
              Console.WriteLine("Ok now you are just showing off!!");
            }
          }

          runningTotal = runningTotal + minutes;

          // Add minutes exercised to total
          // Display total minutes exercised to the screen

          Console.WriteLine("You've entered " + runningTotal + "                 minutes");
          }
          // Repeat until the user quits
          }

         Console.WriteLine("GoodBye!");
  }