a, b, s = map(int, input().split())
if s == 1 or abs(a - s) <= abs(b - s):
    print(abs(a - s) + s)
else:
    # b->a->0
    ans1 = abs(b - s) + abs(b - a) + a
    if a == 0:
        ans1 += 1
    # b->1->0(1階で↓ボタンを押すとAが来る)
    ans2 = abs(b - s) + abs(s - 1) + abs(a - 1) + 1
    print(min(ans1, ans2))