#include<iostream>
#include<iomanip>
#include<string>
#include<algorithm>
#include<vector>
#include<set>
#include<list>
#include<queue>
#include<math.h>
#include<bitset>
using ll = long long;
using namespace std;

int main(){
    string s, op1 = "", op2 ="";
    cin >> s;
    ll sum1 = 0, tmp;
    bool first = true;
    for (int i = 0; i < s.size(); i++){
        if (s[i] == '*' || s[i] == '+'){
            op2 = op1;
            op1 = "";
            op1 += s[i];
            tmp = stoll(s.substr(0, i));
            s = s.substr(i+1);
            i = 0;
            if (first){
                sum1 += tmp;
                first = false;
                continue;
            }
            if (op2 == "*") sum1 += tmp;
            else sum1 *= tmp;
        }
    }
    if (op1 == "*") sum1 += stoll(s);
    else sum1 *= stoll(s);
    cout << sum1 << endl;
}