Alert the user that other datatypes (eg string) was inserted without crashing

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C#

.NET

I want a user to ONLY be able to enter int values from the console namely; the litre, length and height. Alert the user that other datatypes(eg string) was inserted and prompt them to try again. The problem is the code crashes as soon a non-int value is inserted at any of the given values. Any thoughts on how to accomplish this?

What I have tried:

The interfaceClass for calculation. The interfaceClass has two methods calculateArea and totalCost

public interface ICalculation
               {int calculateArea();int totalCost()
}

Inheriting the interface class
The variables are litre, length, height.

 public class Calculation : ICalculation
    {
        public int litre;
        public int length;
        public int height;
        public Calculation()
        {litre= 0;length = 0;height = 0;
  }

   public Calculation(int litre2, int lenght2, int height2)
   {
      this.litre = litre2;
      this.length = lenght2;
      this.height = height2;
   }

     public int calculateArea() {

        return length * height;
     }
     public int totalCost() {

        return calculateArea()* litre;
     }
}

Testing the program to see the output. Create a new object calculation and then prompt the user to fill in the litre, lenght and height. Calcualate the area and total cost after getting the values.

class Tester
   {
       static void Main(string[] args)
       {

           Calculation c = new Calculation();


           try{
               Console.WriteLine("How much litre?");
               c.litre = int.Parse(Console.ReadLine());
               Console.WriteLine("What is the lenght");
               c.length = int.Parse(Console.ReadLine());
               Console.WriteLine("What is the height");
               c.height = int.Parse(Console.ReadLine());

               Console.WriteLine("The Total area " + c.calculateArea());
               Console.WriteLine("The Total cost for the project is " + c.totalCost());
               Console.ReadKey();
          }
          catch(FormatException ){
             Console.WriteLine("{0}is not an integer, try again!");
             // Console.ReadLine();
          }
      }
   }  
}