from math import sqrt
C0,C1,C2,C3=map(int,input().split())
L,R=map(int,input().split())

def f(x):
    return C0+C1*x+C2*x**2+C3*x**3
def absf(x):
    return abs(C0+C1*x+C2*x**2+C3*x**3)

if C3!=0:
    if C2**2-3*C1*C3>=0:
        X1=(-C2+sqrt(C2**2-3*C1*C3))/3/C3
        X2=(-C2-sqrt(C2**2-3*C1*C3))/3/C3
        X=[]
        if L<=X1<=R:
            X.append(X1)
        if L<=X2<=R:
            X.append(X2)
        flag=True
        for x in X:
            if not(f(L)>0 and f(R)>0 and f(x)>0) or not(f(L)<0 and f(R)<0 and f(x)<0) :
                flag=False
        if flag:
            print(0)
            exit()
        else:
            ans=min(absf(L),absf(R))
            for x in X:
                ans=min(ans,absf(x))
            print(ans)
            exit()
    else:
        ans=min(absf(L),absf(R))
        print(ans)
        exit()
        
else:
    if C2!=0:
        ans=min(absf(L),absf(R))
        X=-C1/2/C2
        if L<=X<=R:
            ans=min(ans,absf(X))
    else:
        if C1!=0:
            ans=min(absf(L),absf(R))
        else:
            ans=0
print(ans)