from math import sqrt

C = list(map(int, input().split()))
L, R = map(int, input().split())


def func(x):
    y = 0.0
    a = 1.0
    for i in range(4):
        y += C[i] * a
        a *= x
    return y


Y = [func(L), func(R)]
D = [i * C[i] for i in range(1, 4)]
if C[3] and D[1] * D[1] - 4 * D[0] * D[2] > 0:
    l = (-D[1] - sqrt(D[1] * D[1] - 4 * D[0] * D[2])) / (2 * D[2])
    r = (-D[1] + sqrt(D[1] * D[1] - 4 * D[0] * D[2])) / (2 * D[2])
    if L < l < R:
        Y.append(func(l))
    if L < r < R:
        Y.append(func(r))
elif C[2]:
    m = -D[0] / D[1]
    if L < m < R:
        Y.append(func(m))
if max(Y) < 0:
    print(-max(Y))
elif min(Y) > 0:
    print(min(Y))
else:
    print(0)