def hint1(p1, p2, p3, p4):
    ''' Return True if at least one of the four potions is poisonous,
        and False otherwise''' 

    return p1 or p2 or p3 or p4

def hint2(p2):
    ''' Return True if p2 is not poisonous, and False otherwise'''


def hint3(p1,p3):
    ''' Return True if at least one of p1 and p3 is poisonous,
        and False, otherwise '''


def hint4(p3,p4):
    ''' Return True if at least one of p3 and p4 is not poisonous,
        and False, otherwise '''


def hint5(p1, p3, p4):
    ''' Return True if exactly one of p1, p3, and p4 is poisonous,
        and False, otherwise '''

def solution(p1, p2, p3, p4):
    h1 = hint1(p1, p2, p3, p4)
    h2 = hint2(p2)
    h3 = hint3(p1, p3)
    h4 = hint4(p3, p4)
    h5 = hint5(p1, p3, p4)
    return h1 and h2 and h3 and h4 and h5