# your code goes here

class X:
	def __init__(self, n):
		self.x = n
	def __add__(self, n):
		self.x = self.x + n
	def __repr__(self):
		return str(self.x)

def add_one(a):
	a = a + 1
	
x = X(10)
add_one(x)

print(x)