formation of triangle

# to find out if given sides form a triangle
a=input("enter first side")
b=input("enter second side")
c=input("enter third side")
d=int(a)
e=int(b)
f=int(c)
if d+e>f and e+f>d and f+d>e:
    print("it is atriangle")
else:
    print("not triangle")