from sys import stdin, stdout

def main():
    AB = list(map(int, input().split()))

    AB.sort()
    case1 = (AB[0] ** 2 + AB[1] ** 2) ** 0.5
    case2 = (AB[1] ** 2 - AB[0] ** 2) ** 0.5
    print(min(case1, case2))

input = lambda: stdin.readline()
main()