diff --git a/deriver.py b/deriver.py
index 359e675..9871cbd 100644
--- a/deriver.py
+++ b/deriver.py
@@ -310,7 +310,7 @@ class Simplifier:
 		if term.is_constant():
 			return term.calc()
 		elif isinstance(term,Operator2):
-			print term.__class__.__name__
+			print ( term.__class__.__name__ )
 
 			sleft = Simplifier.simplify(term.left)
 			sright = Simplifier.simplify(term.right)
@@ -330,13 +330,13 @@ class Simplifier:
 		else:
 			return term
 
-sterm = raw_input("Input term (deriving by x): ")
+sterm = input("Input term (deriving by x): ")
 
 term = Parser.parse(sterm)
-print "Deriving %s" % term
+print ( "Deriving %s" % term )
 dterm = Deriver.derive(term,"x")
-print "DTerm: %s" % dterm
+print ( "DTerm: %s" % dterm )
 sterm = Simplifier.simplify(dterm)
-print "Result: %s" % sterm
+print ( "Result: %s" % sterm )