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 = abs(b - s) + s - 1 + abs(a - 1) + 1
    if a == 0:
        ans = min(ans, abs(b - s) + s + 1)
    else:
        ans = min(ans, abs(b - s) + abs(a - s) + a)
    print(ans)