A, B, S = map(int, input().split())
ans = 0
if S == 1:
    if A == 0:
        print(2)
    else:
        print(A)
    exit()
if abs(A - S) <= abs(B - S):
    print(abs(A - S) + S)
else:
    ans = abs(B - S)
    B = S
    if A == 0:
        A += 1
        ans += 1
    ans = min(ans + abs(B - A) + A, ans + abs(B - 1) + A)
    print(ans)