#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
using namespace std;
#define len(n) (int)n.length()
#define pb push_back
#define ll long long
#define make_pair mkp
#define REP(i, n) for(int i = 0;i < n;i++)
#define REPR(i, n) for(int i = n;i >= 0;i--)
#define FOR(i, m, n) for(int i = m;i < n;i++)
#define ALL(v) (v).begin(), (v).end()
#ifdef DBGPRT
#define dbg(n) cerr << "//" << #n << ":" << n <<endl
#else
#define dbg(n) ;
#endif
typedef pair<ll, ll> LLARR;
#define INF 999999999
const double PI = 3.1415926535897932384626433832795;

int main()
{
	ios::sync_with_stdio(false);

	string s;
	cin >> s;
	string ans[2] = {"0",""};
	int op = 0; // 1:+, 2:*
	int i = 0;
	while(s.size())
	{
		if ((s.front() == '*') || (s.front() == '+'))
		{
			if (op)
			{
				ans[0] = (op == 1) ? to_string(atoi(ans[0].c_str()) + atoi(ans[1].c_str())):
									 to_string(atoi(ans[0].c_str()) * atoi(ans[1].c_str()));
			}
			else
			{
				ans[0] = ans[1];
			}
			ans[1] = "";
			op = (s.front() == '*') ? 1 : 2;
		}
		else
		{
			ans[1] += s[i];
		}
		s.erase(s.begin());
	}
	ans[0] = (op == 1) ? to_string(atoi(ans[0].c_str()) + atoi(ans[1].c_str())):
						 to_string(atoi(ans[0].c_str()) * atoi(ans[1].c_str()));
	cout << atoi(ans[0].c_str()) << endl;
	return 0;
}