diff --git a/03-roman-numerals/roman.py b/03-roman-numerals/roman.py
index 57dcb9c..2cc9327 100644
--- a/03-roman-numerals/roman.py
+++ b/03-roman-numerals/roman.py
@@ -1,20 +1,25 @@
-def roman( amount ):
-	romanNum = []
-	symbols = (
-		( 'M', 1000 ),
-		( 'C', 100 ),
-		( 'XC', 90 ),
-		( 'L', 50 ),
-		( 'X', 10 ),
-		( 'IX', 9 ),
-		('V', 5 ) ,
-		( 'IV', 4 ),
-		( 'I', 1 )
-	)
+class int( int ):
 
-	for symbol, value in symbols:
-		while amount >= value:
-			amount -= value
-			romanNum.append( symbol )
+	def roman( self ):
+		romanNum = []
+		symbols = ( ( 'M', 1000 ), ( 'C', 100 ), ( 'XC', 90 ), ( 'L', 50 ), ( 'X', 10 ),
+			( 'IX', 9 ), ('V', 5 ) , ( 'IV', 4 ), ( 'I', 1 ) )
 
-	return ''.join( romanNum )
\ No newline at end of file
+		for symbol, value in symbols:
+			while self >= value:
+				self -= value
+				romanNum.append( symbol )
+
+		return ''.join( romanNum )
+
+n = int( 56 )
+print( n, n.roman() )
+
+# alias int.roman() not to change assert lines 
+roman = int.roman
+
+assert roman( 11 ) == "XI", "11 should return XI"
+assert roman( 60 ) == "LX", "60 should return LX"
+assert roman( 78 ) == "LXXVIII", "78 should return LXXVIII"
+assert roman( 4 ) == "IV", "4 should return IV"
+assert roman( 99 ) == "XCIX", "99 should return XCIX"
\ No newline at end of file