## https://yukicoder.me/problems/no/2970

import math

def main():
    C0, C1, C2, C3 = map(int, input().split())
    L, R = map(int, input().split())

    def func(x):
        return C3 * x **3 + C2 * x ** 2 + C1 * x + C0
    
    if C3 != 0:
        array = []
        array.append(func(L))
        array.append(func(R))

        D = C2 ** 2 - 3 * C3 * C1
        if D > 0:
            beta = (- C2 + math.sqrt(D)) / (3 * C3)
            if L <= beta <= R:
                array.append(func(beta))
            alpha = (- C2 - math.sqrt(D)) / (3 * C3)
            if L <= alpha <= R:
                array.append(func(alpha))
        elif D == 0:
            beta = - C2 / (3 * C3)
            if L <= beta <= R:
                array.append(func(beta))
    elif C2 != 0:
        array = []
        array.append(func(L))
        array.append(func(R))

        beta = -C1 / (2 * C2)
        if L <= beta <= R:
            array.append(func(beta))
    else:
        array = []
        array.append(func(L))
        array.append(func(R))
        
    array.sort()
    if array[0] > 0:
        print(array[0])
    elif array[-1] < 0:
        print(abs(array[-1]))
    else:
        print(0.0)
            




            



if __name__ == "__main__":
    main()