a = float(input())
b = float(input())
print((a+b)/2)
#######################
def S(r):
return 3.14 * r**2
r = float(input())
print(S(r))
#########
print(3.14 * r**2)
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Answers & Comments
a = float(input())
b = float(input())
print((a+b)/2)
#######################
def S(r):
return 3.14 * r**2
r = float(input())
print(S(r))
#########
r = float(input())
print(3.14 * r**2)