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diff --git a/challenge-258/luca-ferrari/python/ch-2.py b/challenge-258/luca-ferrari/python/ch-2.py
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+#!python
+
+#
+# Perl Weekly Challenge 258
+# Task 2
+#
+# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-258>
+#
+
+import sys
+
+
+# task implementation
+# the return value will be printed
+def task_2( args ):
+    k = int( args[ 0 ] )
+    nums = list( map( int, args[ 1: ] ) )
+
+    def is_index_ok( v, k ):
+        b = '{0:08b}'.format( v )
+        count = sum( map( int, list( '{0:08b}'.format( v ) ) ) )
+        return count == k
+
+    indexes = list( filter( lambda i: is_index_ok( i, k ),
+                            range(0, len( nums ) ) ) )
+
+    summy = 0
+    for i in indexes:
+        summy += nums[ i ]
+
+    return summy
+
+
+# invoke the main without the command itself
+if __name__ == '__main__':
+    print( task_2( sys.argv[ 1: ] ) )