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import math
def hours_to_cover_dish(radius_cm):
radius_mm = radius_cm * 10
dish_area_mm2 = math.pi * radius_mm ** 2
organism_size_mm2 = 1
hours = 0
while organism_size_mm2 < dish_area_mm2:
organism_size_mm2 *= 2
hours += 1
return hours
radius_cm = int(input().strip())
print(hours_to_cover_dish(radius_cm))
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