Sum of 3 Integers

using System;

class SumOfThreeInt
{
    static void Main()
    {
        Console.Write("a=");
        double a = double.Parse(Console.ReadLine());
        Console.Write("b=");
        double b = double.Parse(Console.ReadLine());
        Console.Write("c=");
        double c = double.Parse(Console.ReadLine());
        Console.WriteLine("{0} + {1} + {2} = {3}",a,b,c,a+b+c);
    }
}