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#!/usr/bin/env python
# -*- coding: utf-8 -*-
def get_answer(n, x, y):
    if n == 1:
        if x == 1:
            return y
        else:
            return 3 - y + x
    half = pow(2, n - 1)
    if x <= half:
        if y <= half:
            return get_answer(n - 1, y, x)
        else:
            return half * half + get_answer(n - 1, x, y - half)
    else:
        if y <= half:
            return 3 * half * half + get_answer(n - 1, half + 1 - y, half * 2 + 1 - x)
        else:
            return 2 * half * half + get_answer(n - 1, x - half, y - half)
if __name__ == "__main__":
    n, x, y = map(int, raw_input().split())
    print get_answer(n, x, y)
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