import java.util.ArrayDeque;
import java.util.Scanner;

import static java.lang.Integer.parseInt;

import java.util.*;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        String symbol;
        ArrayDeque<Integer> stack = new ArrayDeque<Integer>();

        while (sc.hasNext()) {
            symbol = sc.next();

            if (symbol.equals("+")) {
                stack.push(stack.pop() + stack.pop());
            } else if (symbol.equals("-")) {
                stack.push((stack.pop() * -1) + stack.pop());
            } else if (symbol.equals("*")) {
                stack.push(stack.pop() * stack.pop());
            } else {
                stack.push(Integer.parseInt(symbol));
            }
        }
        System.out.println(stack.pop());
    }
} import java.util.ArrayDeque; ArrayDeque java.util import java.util.Scanner; Scanner java.util import static java.lang.Integer.parseInt; import static java.lang.Integer.parseInt; import static java.lang.Integer.parseInt; import java.util.*; util.* java public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        String symbol;
        ArrayDeque<Integer> stack = new ArrayDeque<Integer>();

        while (sc.hasNext()) {
            symbol = sc.next();

            if (symbol.equals("+")) {
                stack.push(stack.pop() + stack.pop());
            } else if (symbol.equals("-")) {
                stack.push((stack.pop() * -1) + stack.pop());
            } else if (symbol.equals("*")) {
                stack.push(stack.pop() * stack.pop());
            } else {
                stack.push(Integer.parseInt(symbol));
            }
        }
        System.out.println(stack.pop());
    }
} Main public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        String symbol;
        ArrayDeque<Integer> stack = new ArrayDeque<Integer>();

        while (sc.hasNext()) {
            symbol = sc.next();

            if (symbol.equals("+")) {
                stack.push(stack.pop() + stack.pop());
            } else if (symbol.equals("-")) {
                stack.push((stack.pop() * -1) + stack.pop());
            } else if (symbol.equals("*")) {
                stack.push(stack.pop() * stack.pop());
            } else {
                stack.push(Integer.parseInt(symbol));
            }
        }
        System.out.println(stack.pop());
    } main {

        Scanner sc = new Scanner(System.in);

        String symbol;
        ArrayDeque<Integer> stack = new ArrayDeque<Integer>();

        while (sc.hasNext()) {
            symbol = sc.next();

            if (symbol.equals("+")) {
                stack.push(stack.pop() + stack.pop());
            } else if (symbol.equals("-")) {
                stack.push((stack.pop() * -1) + stack.pop());
            } else if (symbol.equals("*")) {
                stack.push(stack.pop() * stack.pop());
            } else {
                stack.push(Integer.parseInt(symbol));
            }
        }
        System.out.println(stack.pop());
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String symbol; symbol ArrayDeque<Integer> stack = new ArrayDeque<Integer>(); stack new ArrayDeque<Integer>() while (sc.hasNext()) {
            symbol = sc.next();

            if (symbol.equals("+")) {
                stack.push(stack.pop() + stack.pop());
            } else if (symbol.equals("-")) {
                stack.push((stack.pop() * -1) + stack.pop());
            } else if (symbol.equals("*")) {
                stack.push(stack.pop() * stack.pop());
            } else {
                stack.push(Integer.parseInt(symbol));
            }
        } sc.hasNext() sc.hasNext sc {
            symbol = sc.next();

            if (symbol.equals("+")) {
                stack.push(stack.pop() + stack.pop());
            } else if (symbol.equals("-")) {
                stack.push((stack.pop() * -1) + stack.pop());
            } else if (symbol.equals("*")) {
                stack.push(stack.pop() * stack.pop());
            } else {
                stack.push(Integer.parseInt(symbol));
            }
        } symbol = sc.next() symbol sc.next() sc.next sc if (symbol.equals("+")) {
                stack.push(stack.pop() + stack.pop());
            } else if (symbol.equals("-")) {
                stack.push((stack.pop() * -1) + stack.pop());
            } else if (symbol.equals("*")) {
                stack.push(stack.pop() * stack.pop());
            } else {
                stack.push(Integer.parseInt(symbol));
            } symbol.equals("+") symbol.equals symbol "+" {
                stack.push(stack.pop() + stack.pop());
            } stack.push(stack.pop() + stack.pop()) stack.push stack stack.pop() + stack.pop() stack.pop() stack.pop stack stack.pop() stack.pop stack if (symbol.equals("-")) {
                stack.push((stack.pop() * -1) + stack.pop());
            } else if (symbol.equals("*")) {
                stack.push(stack.pop() * stack.pop());
            } else {
                stack.push(Integer.parseInt(symbol));
            } symbol.equals("-") symbol.equals symbol "-" {
                stack.push((stack.pop() * -1) + stack.pop());
            } stack.push((stack.pop() * -1) + stack.pop()) stack.push stack (stack.pop() * -1) + stack.pop() (stack.pop() * -1) stack.pop() stack.pop stack -1 1 stack.pop() stack.pop stack if (symbol.equals("*")) {
                stack.push(stack.pop() * stack.pop());
            } else {
                stack.push(Integer.parseInt(symbol));
            } symbol.equals("*") symbol.equals symbol "*" {
                stack.push(stack.pop() * stack.pop());
            } stack.push(stack.pop() * stack.pop()) stack.push stack stack.pop() * stack.pop() stack.pop() stack.pop stack stack.pop() stack.pop stack {
                stack.push(Integer.parseInt(symbol));
            } stack.push(Integer.parseInt(symbol)) stack.push stack Integer.parseInt(symbol) Integer.parseInt Integer symbol System.out.println(stack.pop()) System.out.println System.out System System.out stack.pop() stack.pop stack String[] args args public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        String symbol;
        ArrayDeque<Integer> stack = new ArrayDeque<Integer>();

        while (sc.hasNext()) {
            symbol = sc.next();

            if (symbol.equals("+")) {
                stack.push(stack.pop() + stack.pop());
            } else if (symbol.equals("-")) {
                stack.push((stack.pop() * -1) + stack.pop());
            } else if (symbol.equals("*")) {
                stack.push(stack.pop() * stack.pop());
            } else {
                stack.push(Integer.parseInt(symbol));
            }
        }
        System.out.println(stack.pop());
    }
} public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        String symbol;
        ArrayDeque<Integer> stack = new ArrayDeque<Integer>();

        while (sc.hasNext()) {
            symbol = sc.next();

            if (symbol.equals("+")) {
                stack.push(stack.pop() + stack.pop());
            } else if (symbol.equals("-")) {
                stack.push((stack.pop() * -1) + stack.pop());
            } else if (symbol.equals("*")) {
                stack.push(stack.pop() * stack.pop());
            } else {
                stack.push(Integer.parseInt(symbol));
            }
        }
        System.out.println(stack.pop());
    }
} Main
import java.util.ArrayDeque;
import java.util.Scanner;

import static java.lang.Integer.parseInt;

import java.util.*;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        String symbol;
        ArrayDeque<Integer> stack = new ArrayDeque<Integer>();

        while (sc.hasNext()) {
            symbol = sc.next();

            if (symbol.equals("+")) {
                stack.push(stack.pop() + stack.pop());
            } else if (symbol.equals("-")) {
                stack.push((stack.pop() * -1) + stack.pop());
            } else if (symbol.equals("*")) {
                stack.push(stack.pop() * stack.pop());
            } else {
                stack.push(Integer.parseInt(symbol));
            }
        }
        System.out.println(stack.pop());
    }
}
