# # define : 정의하다# def f(n,m) :# global x #main에서 x변수를 같이 쓰겠다!# x+=10# return n+m# # print(n+"입니다")## # f("상어",10)## x=100# print(f(10,20))## def f(a):# if a>=90 and a<=100:# return 'A'# elif a>=80 and a<90:# return 'B'# elif a>=70 and a<80:# return 'C'# elif a>=60 and a<70:# return 'D'# else:# return 'F'# a=int(input())# print(f(a))# def LCK(a):# s=0# for i in range(1,a+1):# s+=i# return s# a=int(input())# print(LCK(a))# def w(a):# return 3.14*a*a##a=int(input())print('%.2f'%(3.14*a*a))
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