import sequtils,strutils
var
    A,B,S : int
(A, B, S) = stdin.readline.split.map(parseInt)
if abs(A - S) <= abs(B - S) or S == 1:
    echo abs(A - S) + S
else:
    if A > 0:
        echo min(abs(B - S) + S + abs(A - 1), abs(B - S) + abs(S - A) + A)
    else:
        echo abs(B - S) + S + 1