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

def determine_elevator(A, B, S):
    if S == 1:
        return 'A'
    else:
        distance_A = abs(A - S)
        distance_B = abs(B - S)
        if distance_A <= distance_B:
            return 'A'
        else:
            return 'B'

elevator = determine_elevator(A, B, S)

if elevator == 'A':
    cost = abs(A - S) + S
else:
    # X must be A's initial position to call elevator A again
    cost = abs(B - S) + abs(A - S) + A

print(cost)