#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = (a); i < (b); ++i)
#define REP(i,n) FOR(i,0,n)
#define SZ(n) (int)(n).size()
#define ALL(n) (n).begin(), (n).end()
#define MOD 1000003
#define INF 100000000
using namespace std;
typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PI;

int ans = 0;
int t = 0;
bool c = true;

void f() {
	if (c) ans += t;
	else ans *= t;
	t = 0;
}


int main() {
	string n;
	cin >> n;
	for (int i = 0; i < SZ(n); ++i) {
		if (n[i] == '*') {
			f();
			c = true;
		}
		else if (n[i] == '+') {
			f();
			c = false;
		}
		else {
			t *= 10;
			t += n[i] - '0';
		}
	}
	f();
	cout << ans << endl;
}