[1074] 1074번 : Z with python

n, x, y = map(int, input().split())

def power2(k): # 두배 만드는 함수
    return 1 << k

def go(n, x, y):
    if n == 1:
        return 2*x+y
    else:
        if x < power2(n-1): # 점점 쪼개진다.
            if y < power2(n-1):# 점점 쪼개진다.
                return go(n-1, x, y)
            else:
                return go(n-1, x, y-power2(n-1)) + power2(2*n-2)
        else:
            if y < power2(n-1):
                return go(n-1, x-power2(n-1), y) + power2(2*n-2)*2
            else:
                return go(n-1, x-power2(n-1), y-power2(n-1)) + power2(2*n-2)*3;

print(go(n,x,y))