a,b=map(int,input().split())
if (a == b):
    print((a**2+b**2)**0.5)
elif (a < b):
    print(min((a**2+b**2)**0.5, (b**2-a**2)**0.5))
else:
    print(min((a**2+b**2)**0.5, (a**2-b**2)**0.5))