math triangle calculator

import math
def triangle_area(a,b,c):
    s = (a+b+c)/2
    hp = s*(s-a)*(s-b)*(s-c)
    return math.sqrt(hp)

a = int(input("enter side 1: "))
b = int(input("enter side 2: "))
c = int(input("enter side 3: "))
area = triangle_area(a,b,c)
print(area)