BasicMath

using System;

namespace StaticMembersExercises
{
    public class Program
    {
        public static void Main()
        {
            string line = Console.ReadLine().Trim();
            while (!line.Equals("End"))
            {
                string[] calculationInfo = line.Split(new char[] { }, StringSplitOptions.RemoveEmptyEntries);
                string calculation = calculationInfo[0];
                decimal num1 = decimal.Parse(calculationInfo[1]);
                decimal num2 = decimal.Parse(calculationInfo[2]);

                decimal? result = null;
                if (calculation == "Sum")
                {
                    result = MathUtil.Sum(num1, num2);
                }
                else if (calculation == "Multiply")
                {
                    result = MathUtil.Multiply(num1, num2);
                }
                else if (calculation == "Percentage")
                {
                    result = MathUtil.Percentage(num1, num2);
                }
                else if (calculation == "Divide")
                {
                    if (num2 > 0 || num2 < 0)
                    {
                        result = MathUtil.Divide(num1, num2);
                    }
                    else
                    {
                        Console.WriteLine("Infinity");
                    }
                }
                else if (calculation == "Subtract")
                {
                    result = MathUtil.Subtract(num1, num2);
                }

                if (result != null)
                {
                    Console.WriteLine($"{result:F2}");
                }

                line = Console.ReadLine();
            }
        }
    }

    public class MathUtil
    {
        public static decimal Sum(decimal x, decimal y)
        {
            return x + y;
        }

        public static decimal Subtract(decimal x, decimal y)
        {
            return x - y;
        }

        public static decimal Multiply(decimal x, decimal y)
        {
            return x * y;
        }

        public static decimal Divide(decimal x, decimal y)
        {
            //if (y > 0 || y < 0)
            //{
                return x / y;
            //}
            //return 0;
        }

        public static decimal Percentage(decimal totalNumber, decimal percent)
        {
            return totalNumber * percent / 100;
        }
    }
}