#define _USE_MATH_DEFINES
#include <algorithm>
#include <cstdio>
#include <functional>
#include <iostream>
#include <cstring>
#include <climits>
#include <cmath>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <time.h>
#include <vector>
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> i_i;
typedef pair<ll, int> ll_i;
typedef pair<double, int> d_i;
typedef pair<ll, ll> ll_ll;
typedef pair<double, double> d_d;
struct edge { int u, v; ll w; };
 
ll MOD = 1000000007;

int dx[4] = {-1, 0, 1, 0};
int dy[4] = {0, -1, 0, 1};

int hoge(string& s, int& i) {
	int res = 0;
	while (i < s.length() && s[i] >= '0' && s[i] <= '9')
		res = res * 10 + s[i++] - '0';
	return res;
}

int main() {
	string S; cin >> S;
	int i = 0, ans = hoge(S, i);
	while (i < S.length()) {
		if (S[i++] == '*') ans += hoge(S, i);
		else ans *= hoge(S, i);
	}
	cout << ans << endl;
}