#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <map>
#include <list>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <queue>
#include <iomanip>

using namespace std;

int main(void)
{
	char c[10];
	string s;
	int res = 0;
	int cul = 0;

	cin >> s;

	int j = 0;
	for (int i = 0; i < s.length(); i++) {
		if (!('0' <= s[i] && s[i] <= '9')){
			c[j] = '\0';
			if (cul == 0) {
				res += atoi(c);
			} else {
				res *= atoi(c);
			}
			if (s[i] == '+') cul = 1;
			if (s[i] == '*') cul = 0;
			j = 0;
			continue;
		}

		c[j] = s[i];
		j++;
	}

	c[j] = '\0';
	if (cul == 0) {
				res += atoi(c);
			} else {
				res *= atoi(c);
			}

	cout << res << endl;

	return (0);
}