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

min_total = float('inf')

if S == 1:
    # Case 1: Press down button (only A can come)
    total_case1 = abs(S - A) + S
    min_total = min(min_total, total_case1)
    
    # Case 2: Press up button (normal condition)
    a_dist = abs(S - A)
    b_dist = abs(S - B)
    if a_dist <= b_dist:
        total_case2 = a_dist + S
        min_total = min(min_total, total_case2)
else:
    a_dist = abs(S - A)
    b_dist = abs(S - B)
    if a_dist <= b_dist:
        total = a_dist + S
        min_total = total

print(min_total)