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

if S == 1:
    elevator = 'A'
else:
    distance_a = abs(A - S)
    distance_b = abs(B - S)
    if distance_a <= distance_b:
        elevator = 'A'
    else:
        elevator = 'B'

if elevator == 'A':
    ans = abs(A - S) + S
else:
    min_total = float('inf')
    for X in range(1, 101):
        current = (abs(B - S)) + abs(S - X) + abs(A - X) + X
        if current < min_total:
            min_total = current
    ans = min_total

print(ans)