#include <iostream>
#include <string>
using namespace std;
int main() {
    string s, q = "";
    int i, n = -1, dx = 0;
    cin >> s;
    for (i = 0; i < s.length(); i++) {
    	if (n == -1) {
        	if (s[i] == '*') {n = atoi(q.c_str()); dx = 1; q = "";}
        	else if (s[i] == '+') {n = atoi(q.c_str()); dx = 2; q = "";}
        	else {q += s[i];}
    	}
    	else {
        	if (s[i] == '*') {
        		if (dx == 1) {n += atoi(q.c_str()); q = "";}
    			if (dx == 2) {n *= atoi(q.c_str()); q = "";}
    			dx = 1;
        	}
        	else if (s[i] == '+') {
        		if (dx == 1) {n += atoi(q.c_str()); q = "";}
    			if (dx == 2) {n *= atoi(q.c_str()); q = "";}
    			dx = 2;
        	}
        	else {q += s[i];}
    	}
    }
    if (dx == 1) {n += atoi(q.c_str()); q = "";}
    if (dx == 2) {n *= atoi(q.c_str()); q = "";}
    cout << n << endl;
    return 0;
}