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

# Scenario 1: Take elevator A directly
sum1 = abs(A - S) + S

# Scenario 2: Take B to A's initial position, then A to 0 (only if A is not 0)
sum2 = float('inf')
if A >= 1:
    sum2 = (abs(B - S) + abs(S - A)) + A

print(min(sum1, sum2))