#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <string.h>

class Stack
{
 private:
	struct Element
	{
	  int data;
	  Element *next;
	} * pstack;
 public:
	Stack ();
	~Stack ();
	int Empty (void);	
	int Top (void);		
	int Pop (void);		
	int Push (int x);	 
};

Stack::Stack ()
{
    pstack = NULL;
}

Stack::~Stack ()
{
    Element * temp;
    while (pstack)
    {
          temp = pstack;
          pstack = pstack->next;
          delete temp;
    }
}

int Stack::Empty()
{
	if (pstack == NULL)
		return 1;
	else
		return 0;
}

int Stack::Top ()
{
	return pstack->data;
}

int Stack::Pop ()
{
	Element *del = pstack;
	int temp = pstack->data;
	pstack = pstack->next;
	delete del;
	return temp;
}

int Stack::Push (int x)
{
	Element *ins = new Element;
	if (ins==NULL) return 0;
	ins->data = x;
	ins->next = pstack;
	pstack = ins;
	return 1;
}



int main(void)
{
	Stack MyStack;
	char eq[100]={},*pch;
	gets(eq);
	int a,b;
	strrev(eq);
  	pch = strtok(eq," ");
  	while (pch != NULL)
  	{
  		_strrev(pch);
    	if (pch[0]>='0' && pch[0]<='9') MyStack.Push(atoi(pch));
    	else
    	{
    		switch(pch[0])
    		{
    			case '*':
    				a=MyStack.Pop();
    				b=MyStack.Pop();
    				MyStack.Push(a*b);
    				break;
    			case '/':
    				a=MyStack.Pop();
    				b=MyStack.Pop();
    				MyStack.Push(a/b);
    				break;
    			case '+':
    				a=MyStack.Pop();
    				b=MyStack.Pop();
    				MyStack.Push(a+b);
    				break;
    			case '-':
    				a=MyStack.Pop();
    				b=MyStack.Pop();
    				MyStack.Push(a-b);
    				break;
    			default:
    				break;
			}
		}
    	pch = strtok (NULL, " ");
 	}
 	printf("Result : %d ", MyStack.Top());
	_getch();
	return 0;
}