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);	var ans =	0;
if	(a
== 0)	{ if (la <= lb)
{
return	la
+
s; }else{ return	lb	+ s +	1;
} }else{ if (la <=
lb) {
return la	+
s;	}else{ return	lb	+	s;
}	}
}
def abs(n) {	if	(n < 0) {
return -n; } return n;
} 
 	
					
	

   
    

  			 
    
 
 	
	 			   		    
	  	 
 
			
 
    	  	
 
		  	
			
 
	   	 	 
	  
	   
 
			 

  	
 


	

  		

 	 

 	 

 	 
 
  	  	 
 	  	  

 		 			

 		  	
 

   	 	 

 		 	  
 

 	
 	 
 

    

	

  	 			
 
  	  		
	  	
 		 
 	  	 
 	  	  
	  	
 		 
    
 	  		
    
	  	
	 	  
    

 
	 	

  	  
   	

  	 	

	 	 		
 	  	 
 	  	 
 
		  	
				 
   	

 
			

  		 
    

  			

	 	   
 	  	 
 	  		 
	    	
 		 

	
 


 
	 	 

  	   
 	  	
 	  		 
	      	
	    	
 		 

	
 


  	 	 

 
	   	

  	 		
 	  	 
 	  	 
 
		  	
				  
   	

 
		 	

  		  
    

  		 	

	 				
 	  	 
 	  		 
	    	
 		 

	
 


 
	  	 

  				
 	  	
 	  		 
	    	
 		 

	
 


  	  	 

  	   	
 	
 	 
 

    
 	
 		

	

  	 
 
     
	  	
			    
    

 
	 	 	

  	    
   	

  	 	 	

	 	  		
 
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