If statements printing after a variable is entered

I'm new to programming/coding and I'm using Python in my course. I have been asked to create a calculator that can add, subtract, divide and multiply. I'm trying to get the program to receive the numbers through input, then ask for what to do with it (eg. plus or minus) through a number entered and then give a result. I have the input stages of the code working but when I get to the last part I cant get it to work. This is the code

FirstNumber = "blank1"
SecondNumber = "blank2"
Device = "blank3"
FirstNumber = input("First number?")
SecondNumber = input("Second number?")
Device = input("Select a Number. Options are; 1.Plus, 2.Minus, 3.Times, 4.Divide.")
if "Device" == 1:
     print("FirstNumber"+"SecondNumber")

When it gets the the end it does nothing, help please.