/*
 
# 
#
#
#   Author: Fabrice B. -> [contact:grafitos@nomade.fr]
#
#
# 
#		This program is free software; you can redistribute it and/or
#		modify it under the terms of the GNU General Public License
#		as published by the Free Software Foundation; either version
#		2 of the License, or (at your option) any later version.
#
# 

*/


import java.lang.*;
import java.io.*;


class automate_calcul {
	
	double op1,op2;
	char operator,val;
	String operande;
	int stat;
	int m_p;

	private void reset_automate ()
	{
		op1=op2=0;
		stat=1;
		operande="0";
		operator=0;	
		m_p=0;
	}		
	
	public automate_calcul()
	{
		reset_automate();
	}
		
	private double result()
	{
		if(operator=='+') return op1+op2;
		if(operator=='-') return op1-op2;
		if(operator=='*') return op1*op2;
		if(operator=='/') return op1/op2;
		return 0;
	}
	
	private boolean is_operator()
	{
		if(val=='+' || val=='-' || val=='*' || val=='/') return true; else return false;
	}
	
	private boolean is_quantify()
	{
		if(val>='0' && val<='9') return true; else return false;
	}
	
	private boolean is_result()
	{
		if(val=='=') return true; else return false;
	}
	
	private boolean is_unary()
	{
		if(val=='-' || val==',' || val=='R' || val=='X' || val=='C' || val=='E') return true; else return false;
	}
	
	private void unary_operation()
	{
		if(val=='-') minus_plus();
		if(val=='R')operande=Double.toString(Math.sqrt(number(operande)));
		if(val=='X')operande=Double.toString(1/number(operande));
		if(val==',' && operande.indexOf(',')==-1) operande+=',';
		if(val=='C') reset_automate();
		if(val=='E') operande="0";
  		
	}
	
	private void operande_add()
	{
		if(operande.equals("0")) operande=Character.toString(val); else operande+=val;
	}
		
	public void print_screen()
	{
		if(operande.length()>=2 && operande.substring(operande.length()-2,operande.length()).equals(".0"))
		
			operande=operande.substring(0,operande.length()-2);
		
		System.out.println(operande);
	}

	private double number(String e)
	{
        return Double.parseDouble(e.replace(',','.'));
	}		
	
	private void minus_plus()
	{
		switch(m_p)
		{
			case 0:
					operande='-'+operande;
					m_p=1;
					break;
			case 1:
					operande=operande.substring(1);
					m_p=0;
					break;
		}
	}
	
	public void get_token( String mem )
	{
		val=mem.charAt(0);
		
		if(is_unary())
		{
			unary_operation();
		}
		
		if(is_quantify())
		{
			switch (stat)
			{
				case 1:
						
						operande_add();
						break;
				case 2:
						operande=Character.toString(val);
						stat=3;
						break;
				case 3:
						operande_add();
						break;
				case 4:
						operande=Character.toString(val);
						stat=1;
						break;
			}
						
		}
		
		if(is_operator())
		{
			operator=val;
			switch(stat)
			{
				case 1:
						op1=number(operande);
						stat=2;
						break;
				case 2:
						
						break;
				case 3:
						op2=number(operande);
						operande=Double.toString(result());
						op1=number(operande);
						stat=2;
						break;
				case 4:
						
						op1=number(operande);
						stat=2;
						break;
			}
		}
		
		if(is_result())
		{
			switch(stat)
			{
				case 1:
						break;
				case 2:
						break;
				case 3:
						op2=number(operande);
						operande=Double.toString(result());
						break;
				case 4:
						op1=number(operande);
						operande=Double.toString(result());
						break;
			}
			stat=4;

		}
		
		
		if(val=='%')
		{
			switch (stat)
			{
				case 1:
						reset_automate();
						break;
			    case 2:
			    		op2=number(operande);
			    		operande=Double.toString(op2*op1/100);
			    		stat=3;
			    		break;
			    case 3:
			    		op2=number(operande);
			    		operande=Double.toString(op2*op1/100);
			    		break;
			    case 4:
			    		op2=number(operande)*op1/100;		
			    		operande=Double.toString(result());
			    		break;
			    
			}
		}
		
		print_screen();
	}
		
}
	
	
class automate_cal {
	
	public static void main (String argv[])
	{
		automate_calcul mine=new automate_calcul();
		mine.get_token("5");
		mine.get_token("0");
		mine.get_token("+");
		mine.get_token("2");
		mine.get_token("5");
		mine.get_token("=");
		mine.get_token("%");

	
	}
}