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

int main() {
	string S;
	long long Cur = 0, ANS = 0;
	vector<long long> VA, VB;
	cin >> S;
	for (int i = 0; i < S.size(); i++) {
		if ('0' <= S[i] && S[i] <= '9') {
			Cur = Cur * 10 + (S[i] - '0');
		}
		else {
			VA.push_back(Cur);
			Cur = 0;
			if (S[i] == '*') VB.push_back(1);
			if (S[i] == '+') VB.push_back(2);
		}
	}
	VA.push_back(Cur);
	ANS = VA[0];
	for (int i = 0; i < VB.size(); i++) {
		if (VB[i] == 1) {
			ANS += VA[i + 1];
		}
		else {
			ANS *= VA[i + 1];
		}
	}
	cout << ANS << endl;
}