a= float (input("Enter the first side of the triangle : "))
b = float (input("Enter the second side of the triangle: ")) 
c=float(input ("Enter the third side of the triangle: "))
print(a,b,c)
s=(a+b+c)/2
area=(s*(s-a)*(s-b)*(s-c))**0.5
print ("area="+str(area))