import math

u = float(input('Usual: \n'))
f = float(input('Final Exam: \n'))

c = u * 40 + f * 60
total = c / 100

print(f"Final Grade: {total:.2f}")

a = float(input('A \n'))
b = float(input('B \n'))
c = float(input('C \n'))


if (a + b > c) and (a + c > b) and (b + c > a):
    length = a + b + c
    print("周长 " + str(length))
    s = length / 2
    area = math.sqrt(s * (s - a) * (s - b) * (s - c))
    print("面积 " + str(area))
else:
    print("无效的三角形三边")


temp = input("TEMP INPUT \n")

isCelsius = False

if str(temp).__contains__("C"):
    isCelsius = True

temp = float(temp.replace("C", ""))

#转换成华氏度
if (isCelsius):
    print("Fahrenheit should be " + str(temp * 1.8 + 32))
else:
    print("Celsius should be " + str((temp - 32) / 1.8) )