#include <iostream>

using namespace std;

string S;

int main() {
	cin >> S;
	S += '*';
	int res = 0;
	char opr = '*';
	int cur = 0;
	for (int i = 0; i < S.length(); i++) {
		if ('0' <= S[i] && S[i] <= '9') {
			cur = cur * 10 + (S[i] - '0');
		} else {
			if (opr == '*') {
				res += cur;
			} else {
				res *= cur;
			}
			opr = S[i];
			cur = 0;
		}
	}
	cout << res << endl;
	return 0;
}