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