def main():
    a, b, s = map(int, input().split())
    if s == 1:
        print(abs(a - 1) + 1)
    elif abs(a - s) <= abs(b - s):
        print(abs(a - s) + s)
    else:
        ans = 1000000000000
        if a != 0:
            ans = abs(b - s) + abs(s - a) + a
        ans = min(ans, abs(b - s) + abs(s - 1) + abs(a - 1) + 1)
        print(ans)


if __name__ == '__main__':
    main()