from itertools import combinations

data = open(0).read().strip()

# hit points, damage, armor
enemy = [100, 8, 2]

weapons = [
    [8, 4, 0],
    [10, 5, 0],
    [25, 6, 0],
    [40, 7, 0],
    [74, 8, 0],
]

# Armor:      Cost  Damage  Armor
armor = [
    [13, 0, 1],
    [31, 0, 2],
    [53, 0, 3],
    [75, 0, 4],
    [102, 0, 5],
]

rings = [
    [25, 1, 0],
    [50, 2, 0],
    [100, 3, 0],
    [20, 0, 1],
    [40, 0, 2],
    [80, 0, 3],
]


def player_configs():
    for wc, wd, wa in weapons:
        for ac, ad, aa in armor:
            for i in range(1, 3):
                for rgs in combinations(rings, i):
                    c = wc + ac
                    d = wd + ad
                    a = wa + aa
                    for rc, rd, ra in rgs:
                        c += rc
                        d += rd
                        a += ra
                    yield (c, d, a)
            c = wc + ac
            d = wd + ad
            a = wa + aa
            yield (c, d, a)
        for i in range(1, 3):
            for rgs in combinations(rings, i):
                c = wc
                d = wd
                a = wa
                for rc, rd, ra in rgs:
                    c += rc
                    d += rd
                    a += ra
                yield (c, d, a)


def simulate(player, enemey):
    ppoints, pdamage, parmor = player
    epoints, edamage, earmor = enemey

    while ppoints > 0 and epoints > 0:
        epoints -= max(pdamage - earmor, 1)
        ppoints -= max(edamage - parmor, 1)

    if epoints <= 0:
        return True
    return False


part_1 = False
if part_1:
    min_win = float("inf")
    for c, d, a in player_configs():
        if simulate([100, d, a], list(enemy)):
            min_win = min(c, min_win)
    print(min_win)
else:
    max_loss = 0
    for c, d, a in player_configs():
        if not simulate([100, d, a], list(enemy)):
            max_loss = max(c, max_loss)
    print(max_loss)