#include <iostream>
#include "stack.h"
using namespace std;

int main(){
	Stack<char> stack;
	for (int i = 0; i < 9; i++)
    {
        char t;
        cin >> t;
        stack.push(t);
    }
    while (stack.getSize() > 1)
    {
        int num = stack.pop() - '0';
        char op = stack.pop();
        int num2 = stack.pop() - '0';
        switch (op)
        {
        case '+':
            num = num2+num; break;
        case '-':
            num = num2-num; break;
        case '*':
            num = num2*num; break;
        case '/':
            num = num2/num; break;
        }
        cout << (char)(num+'0') << endl;
        stack.push((char)(num+'0'));
    }
	
	system("pause");
	return 0;
}