``День 2: 30 дней программирования на python
`first_name, last_name, full_name, country, city, age, year, is_married ='Милена', 'Гаврикова', 'Сергеевна', 'Россия', 'Находка', 19, 24 , False
print( type(first_name))
print(len(first_name))
print(type(last_name))
print( len(last_name), type(last_name))
print( type(country))
print( type(city))
print(type(age))
print(type(is_married))

num_one, num_two = 5, 4
total = num_one+num_two
diff = num_two-num_one
product = num_two*num_one
division = num_one/num_two
rest = num_two%num_one
exp = num_one**num_two
floor_division = num_one//num_two

r = int(input())
area_of_circle = 3,14 * r**2
circum_of_circle = 3,14 * 2 * r
print(area_of_circle)