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

if abs(a - s) <= abs(b - s) or s == 1:
    print(abs(a - s) + s)
else:
    dist = abs(a - s) + abs(b - s) + a
    if a == 0:
        dist += 1
    distt = abs(a - 1) + abs(b - s) + abs(s - 1) + 1
    print(min(dist, distt))