import math

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

  if a == b:
    print(math.sqrt(
      a**2 + b**2
    ))

  else:
    hypo = max(a, b)
    side = min(a, b)

    print(math.sqrt(
      hypo**2 - side**2
    ))

main()