#
# µû¶óÇÏ¸ç ¹è¿ì´Â ÆÄÀ̽ã°ú µ¥ÀÌÅÍ°úÇÐ(»ý´ÉÃâÆÇ»ç 2020)
# 6.9 ÇÔ¼ö ¾È¿¡¼ Àü¿ªº¯¼ö »ç¿ëÇϱâ : global Å°¿öµå, 156ÂÊ
#
def calculate_area(radius):
area = 3.14 * radius ** 2
return area
area = 0
r = float(input("¿øÀÇ ¹ÝÁö¸§: "))
area = calculate_area(r)
print(area)