#!/usr/bin/env python3
#fileencoding: utf-8

a, b = [int(i) for i in input().strip().split(" ")]

ub = 2000000000
count = 0
if a > b:
    count += a - b - 1
    count += ub - a
else:
    count += a - 1
    count += b - a - 1
print(count)