A, B, S = map(int, input().split())

if S == 1:
    # Only A can be called
    moves = abs(A - 1) + 1
else:
    a_dist = abs(A - S)
    b_dist = abs(B - S)
    if b_dist < a_dist:
        # B is called, then go to 1st floor and call A
        moves = b_dist + S + abs(A - 1)
    else:
        # A is called
        moves = a_dist + S

print(moves)