```
java ru.fizteh.fivt.students.elenav.calc.Calculator ()
()
Exception in thread "main" java.util.NoSuchElementException
	at java.util.LinkedList.getLast(LinkedList.java:255)
	at ru.fizteh.fivt.students.elenav.calc.Calculator.calculate(Calculator.java:136)
	at ru.fizteh.fivt.students.elenav.calc.Calculator.main(Calculator.java:150)
```