def calculate(firstOperand, secondOperand, operand):
        if operand == '+' :
                print(firstOperand + secondOperand)
        elif operand == '-':
                print(firstOperand - secondOperand)
        elif operand == '*':
                print(firstOperand * secondOperand)
        elif operand == '/':
                print(firstOperand  / secondOperand)


def menu():
        print("Welcome to the calculator program")
        print("Please enter your operands and  operator")
        firstOperand = raw_input("\nFirst operand:")
        secondOperand = raw_input("\nSecond operand:")
        operand = raw_input("\n Operand:")
        return (firstOperand, secondOperand, operand)

(fistOperand, secondOperand, operand) = menu()

calculate(firstOperand, secondOperand, operand)