**1074-Z (python, 파이썬)

N, r, c = map(int, input().split())

def Z(msize, x, y):
    if msize == 1:
        return 0
    msize //= 2    
    for i in range(2):
        for j in range(2):
            if x < msize * (i+1) and y < msize * (j+1):
                return (i*2+j) * msize * msize + Z(msize, x-msize*i, y-msize*j)

print(Z(2 ** N, r, c))