[Python] Python problems with division

I've been attempting to make a calculator where you enter a number then the calculator divides it by 10 then times it by 4 to work out 40%, then prints the final number.

a = input("Enter amount: ")
b = a / 10
c = b * 4
print(c)


When I run the code I receive this error message: TypeError: unsupported operand type(s) for /: 'str' and 'int'

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