def main():
    A, B = map(int, input().split())
    
    if A > B:
        print((2000000000 - (A + 1) + 1) + ((A - 1) - (B + 1) + 1))
    else:
        print(((A - 1)  - 1 + 1) + ((B - 1) - (A + 1) + 1))

if __name__ == '__main__':
    main()