# define functions
def add(x, y):
   """This function adds two numbers""
   return x + y
def subtract(x, y):
   """This function subtracts two numbers"""
   return x - y
def multiply(x, y):
   """This function multiplies two numbers"""
   return x * y
def divide(x, y):
   """This function divides two numbers"""
   return x / y
# take input from the user
print("Select operation.")
print("1.Add")
print("2.Subtract")
print("3.Multiply")
print("4.Divide")

choice = input("Enter choice(1/2/3/4):")

num1 = int(input("Enter first number: "))
num2 = int(input("Enter second number: "))

if choice == '1':
   print(num1,"+",num2,"=", add(num1,num2))

elif choice == '2':
   print(num1,"-",num2,"=", subtract(num1,num2))

elif choice == '3':
   print(num1,"*",num2,"=", multiply(num1,num2))
elif choice == '4':
   print(num1,"/",num2,"=", divide(num1,num2))
else:
   print("Invalid input")