print("Hello, my name is calculator! And what about you? ")
name = input( "My name is: ")
name1 = "Andrew"
if name != name1:
	print('Error')
	exit(0)
what = input( "what we doing? (+,-,*,/,**,%,//): " )
a = float( input( "Write first number: ") )
b = float( input( "Write second number: ") )
c = None

if what == "+":
	c = a + b
elif what == "-":
	c = a - b
elif what == "*":
	c = a * b
elif what == "/":
	c = a / b
elif what == "**":
	c = a ** b
elif what == "%":
	c = a % b
elif what == "//":
	c = a // b

if c:
	print("equals: ",c)
else:
	print("Invalid action")