Calculator

#Coded by IssacX
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#|Python|Calculator|#
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import math

print """
Calculator coded by IssacX
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#|Python|Calculator|#
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"""
def calculate():
    process = raw_input("Are you going to: Add, Subtract, Multiply, or Divide?\n>")
    if process== "add":
        def add():
            print("Enter two Numbers\n")
            a = int(raw_input('A = '))
            b = int(raw_input('B = '))
            c = a + b
            print ('C = %s' %c)
        add()
    elif process == "subtract":
        def sub():
            print("Enter two Numbers\n")
            a = int(raw_input('A = '))
            b = int(raw_input('B = '))
            c = a - b
            print ('C = %s' %c)
        sub()
    elif process == "multiply":
        def mul():
            print("Enter two Numbers\n")
            a = int(raw_input('A = '))
            b = int(raw_input('B = '))
            c = a * b
            print ('C = %s' %c)
        mul()
    elif process == "divide":
        def mul():
            print("Enter two Numbers\n")
            a = int(raw_input('A = '))
            b = int(raw_input('B = '))
            c = a / b
            print ('C = %s' %c)
        mul()
    calculate()
calculate()