A,B,S=[int(i) for i in input().split()]

move_sum=0
if S==1:
    move_sum=abs(S-A)+1
elif abs(A-S)<=abs(B-S):
    move_sum=abs(A-S)+S
else:
    move_sum=abs(B-S)-1+S+abs(A-1)+1
print(move_sum)