def solve():
    import math
    a, b = list(map(int, input().split()))
    L = max(a,b)
    S = min(a,b)
    if S == L:
        bow = L**2 + S**2
        print( math.sqrt(bow) )
    else :
        bow = L**2 - S**2
        print( math.sqrt(bow) )

solve()