#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
#include <iomanip>
using namespace std;
#define INF 1e9
#define PI acos(-1)
typedef long long ll;

int sum, sub;
bool ch;

void calc() {
	if (ch)sum *= sub;
	else sum += sub;

	sub = 0;
}

int main() {
	string str; cin >> str;
	for (int i = 0; i < str.size(); i++) {
		if (str[i] == '*') {
			calc();
			ch = false;
		}
		else if (str[i] == '+') {
			calc();
			ch = true;
		}
		else {
			sub *= 10;
			sub += str[i] - '0';
		}
	}
	calc();
	cout << sum << endl;

	return 0;
}