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

min_total = float('inf')

if S == 1:
    # Down button case: B cannot move, so A comes
    total_down = abs(A - 1) + 1
    min_total = min(min_total, total_down)
    
    # Up button case: check if A is closer or equal
    a_dist = abs(A - 1)
    b_dist = abs(B - 1)
    if a_dist <= b_dist:
        total_up = a_dist + 1
        min_total = min(min_total, total_up)
else:
    # For other floors, check if A is closer or equal when pressing down button
    a_dist = abs(A - S)
    b_dist = abs(B - S)
    if a_dist <= b_dist:
        total = a_dist + S
        min_total = total

print(min_total)