a, b, s = map(int, input().split())

step = 0
if s == 1 or abs(s - a) <= abs(s - b):
    # A → goal
    step += abs(s - a) + s
else:
    # B → A → goal
    step += abs(s - b)
    if a == 0:
        step += abs(a - 1) + s
    else:
        step += min(abs(a - 1) + s, abs(s - a) + a)

print(step)