Dance_hall_5_Python

l = float(input())
w = float(input())
a = float(input())

area_kv_sm = (50 * 100) * (25 * 100)
garderob = (200 * 200)
peika = area_kv_sm / 10
free_space = area_kv_sm - garderob - peika

count_dancers = free_space / (40 + 7000)
print(f'{count_dancers:.0f}')