push1   	
input	
		push2   	 
push1   	
write		 push3   		
push0    
write		 label1
   	
push1   	
read			push2   	 
read			subtract	  	goto_ifnegative2
		 	 push2   	 
read			push3   		
read			add	   push3   		
swap 
	write		 push2   	 
read			push1   	
add	   push2   	 
swap 
	write		 goto1
 
 	
label2
   	 
push3   		
read			output	
 	end