def moshnost(v):
    return v ** 3 * 115.923


deficits, windspeeds = eval(input())

fir = False
sec = False
summ = 0
count = 0
while not (fir and sec):
    fir = True
    sec = True
    for i in range(len(deficits)):
        k = i
        while k <= k + 24:
            if k >= 239:
                break
            summ += deficits[k]
            k += 1
        if summ / 24 > 1000000:
            sec = sec and False
        summ = 0
    for i in range(len(deficits)):
        if deficits[i] > 500000:
            fir = fir and False
    if not (fir and sec):
        count += 1
    else:
        print(count)
        exit(0)
    for i in range(len(deficits)):
        deficits[i] = deficits[i] - moshnost(windspeeds[i])
print(count)