def add(x, y):
   return x + y

def subtract(x, y):
   return x - y

def multiply(x, y):
   return x * y

def divide(x, y):
   return x / y

def power(x, y):
   return x ** y

print("Select operation.")
print("1.Add")
print("2.Subtract")
print("3.Multiply")
print("4.Divide")
print("5.Power")
 
choice = input("Enter choice(1/2/3/4/5):")
 
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))

elif choice == '5':
   print(num1,"^",num2,"=", power(num1,num2)) 

else:
   print("Invalid input")