using System;
using System.Collections.Generic;
using System.Text;
class Program
{
static void Main(string[] args)
{
byte b1 = 100;
byte b2 = 250;
try
{
byte sum = unchecked((byte)(b1 + b2));
Console.WriteLine("sum = {0}", sum);
}
catch (OverflowException ex)
{
Console.WriteLine(ex.Message);
}
}
}