import numpy as np


a, b = [int(x) for x in input().split(' ')]
if b > a:
    a, b = b, a

if a != b:
    c = np.sqrt(np.array([a ** 2 - b ** 2]))

else:
    c = np.sqrt(np.array([a ** 2 + b ** 2]))
    
print(c[0])