a = 10 
b = 1

while a > 0:
    b = b * 2 
    a = a - b 

print("a =", a)
print("b =", b)

'''
a = 10
b = 1

b = 2 
a = 8

b = 4 
a = 4 

b = 8
a = 4 - 8 = -4
'''