import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

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

def f(A,B,S):
    if abs(A-S) <= abs(B-S) or S == 1:
        return abs(A-S) + abs(S)
    x = abs(B-S) + abs(S-1) + abs(A-1) + 1
    if A == 0:
        return x
    y = abs(B-S) + abs(S-A) + abs(A)
    return min(x,y)

# f(5,10,7), f(10,50,30), f(0,1,1)

answer = f(A,B,S)
print(answer)