from math import *
from decimal import Decimal

a, b, c = float(input()), float(input()), float(input())
perimeter = Decimal(a + b + c).quantize(Decimal('0.01'), rounding='ROUND_HALF_UP')
s = float(perimeter/2)
area = Decimal(sqrt(s*(s-a)*(s-b)*(s-c))).quantize(Decimal('0.01'), rounding='ROUND_HALF_UP')
print(f'周长={perimeter}')
print(f'面积={area}')