#include <bits/stdc++.h>
using namespace std;

using ll = long long;
#define rep(i, n) for(int i = 0; i < n; i++)

int main() {
	string s;
	cin >> s;
	ll ans = 0, d = 0, sz = s.size();
	char f = 0;
	rep(i, sz) {
		if(isdigit(s[i])) {
			if(f) d = d * 10 + s[i] - '0';
			else ans = ans * 10 + s[i] - '0';
		}
		else {
			if(f == 0) f = s[i];
			else {
				if(f == '*') ans += d;
				else ans *= d;
				d = 0;
				f = s[i];
			}
		}
	}
	if(f == '*') ans += d;
	else if(f == '+') ans *= d;
	cout << ans << endl;
}