...

H.py

@@ -0,0 +1,12 @@
+from __future__ import print_function
+import sys
+def to_int(x):
+  bs = []
+  for b in x:
+    if bs and bs[-1]:
+      bs.append(0 if b == "1" else 1)
+    else:
+      bs.append(1 if b == "1" else 0)
+  return int("".join(map(str, bs)), 2)
+n, a, b = sys.stdin.readline().split(); n = int(n)
+print(to_int(b) - to_int(a) - 1)