asm("mark\soutchar;outchar;push\s0;return");
asm("mark\soutnum;outnum;push\s0;return"); asm("mark\sreadchar;push\s0;dup;readchar;retrieve;return");	asm("mark\sreadnum;push\s0;dup;readnum;retrieve;return");	asm("mark\snextInt;push\s0;mark\snextIntloop;push\s0;dup;readchar;retrieve;push\s48;sub;dup;jneg\snextIntend;dup;push\s9;swap;sub;jneg\snextIntend;swap;push\s10;mul;add;jump\snextIntloop;mark\snextIntend;disc;return");	def
main()
{
var
a
= nextInt(); var	b =	nextInt(); var	s
=	nextInt();
outnum(solve(a,b,s)); outchar('\n'); } def solve(a,b,s) { var
la
=	abs(a-s);
var
lb = abs(b-s);	if (s	== 1)
{	return
la +	1; } if (la <=
lb)
{	return
la
+ s; }else{	return	min(lb +	abs(a-s) +
a, lb + (s-1) +
a); }
} def	abs(n)
{	if (n	<	0)	{
return	-n;
}
return n; }	def	min(a,b) { if	(a
< b) { return a;
} return
b; }	
					
	

   
    

  				
    
 
 	
	 			   		    
	  	 
 
			 
 
    	  	
 
		  	
			 
 
	   	 	 
	  
	   
 
				

  	 
 


	

  		

 	 

 	 

 	 
 
  	  	 
 	  	  

 			   

 		 	 
 

   	 	 

 		 	 	
 

 	
 	 
 

    

	

  		   
 
  	  		
	  	
 		
 	  	 
 	  	  
	  	
 		
 	  	  
   	
	  	
	 	 	
    

 
		 

  	 	
   	

  		 

	 			
 	  	
   	
	    	
 	 	

	
 


 
	   

  			

  	   
 	  	
 	  	
 
		  	
			  	
   	

 
	 		

  	  	
    

  	 		

	 		  
 	  	
 	  	 	
	    	
 	 	

	
 


 
			 

  		  
 
  	  	 	
   	
	  		    	  		
	    	  	
 	  	  
 	  			
	  	
 		
	    	  	  
	   
 		  
 	
 	 	

	
 


  			 
 

 

    
 	
 		

	

  	
 
     
	  	
			    
    

 
	  	 

  	    
   	

  	  	 

	 		 	
 
   	-