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