# coding=utf-8a,b,c=map(int,raw_input().split())defchange(a1,b1,c1):while1:ifnota1+b1>c1:c1-=1elifnotabs(a1-b1)<c1:ifcmp(a1,b1)==1:a1-=1elifcmp(a1,b1)==0:a1-=1elifcmp(a1,b1)==-1:b1-=1elifa1+b1>c1 andabs(a1-b1)<c1:returna1,b1,c1c,b,a=change(a,b,c)c,a,b=change(a,b,c)print(a+b+c)