from math import floor
length_in_ms = float(input())
wide_in_ms = float(input())
wide_in_sms = wide_in_ms * 100
length_in_sms = length_in_ms * 100
desks = (wide_in_sms - 100) // 70
rows = length_in_sms // 120
count_seats = (desks * rows) - 3

print(floor(count_seats))