a, b = map(int, input().split())
m = 2000000000
c = [0] * 4

if (a > b):
    # (1, 3, 2) => b < c < a
    c[0] = a - b - 1
    # (2, 3, 1) => b < a < c
    c[1] = m - a
elif (a < b):
    # (2, 1, 3) => c < a < b
    c[2] = a - 1
    # (3, 1, 2) => a < c < b
    c[3] = b - a - 1

print(sum(c))