#include <iostream>
#include <string>
using namespace std;

int main(void)
{
	string S;
	cin >> S;

	int k1 = 0, k2 = k1;
	while('0' <= S[k2] && S[k2] <= '9' ) k2++;
	int ans = stoi(S.substr(k1, k2));
	k1 = k2;
	k2++;
	while(k1 < S.size()) {
		if(S[k1] == '+') {
			while('0' <= S[k2] && S[k2] <= '9' ) k2++;
			ans *= stoi(S.substr(k1+1, k2));
		} else if(S[k1] == '*') {
			while('0' <= S[k2] && S[k2] <= '9' ) k2++;
			ans += stoi(S.substr(k1+1, k2));
		}
		k1 = k2;
		k2++;
	}

	cout << ans << endl;

	return 0;
}