1 files changed, 21 insertions, 0 deletions
diff --git a/challenge-079/roger-bell-west/python/ch-1.py b/challenge-079/roger-bell-west/python/ch-1.py
new file mode 100755
index 0000000000..c3c5aff095
--- /dev/null
+++ b/challenge-079/roger-bell-west/python/ch-1.py
@@ -0,0 +1,21 @@
+#! /usr/bin/python
+
+import unittest
+
+def csb(tot):
+    bits=0
+    m=1000000007;
+    for n in range(1,tot+1):
+        bits += bin(n).count("1")
+        bits %= m
+    return bits
+
+class TestCsb(unittest.TestCase):
+
+    def test_ex1(self):
+        self.assertEqual(csb(4),5,'example 1')
+
+    def test_ex2(self):
+        self.assertEqual(csb(3),4,'example 2')
+
+unittest.main()