#include <iostream>
using namespace std;
int main(){
    string s;cin>>s;
    char prev = '-';
    int previ = 0;
    int nwi = 0;
    for(int i = 0; s.size() > i; i++){
        if(s[i] == '+' || s[i] == '*'){
            if(prev != '-'){
                if(prev == '+'){
                    previ *= nwi;
                }else{
                    previ += nwi;
                }
            }else{
                previ = nwi;
            }
            prev = s[i];
            nwi = 0;
        }else{
            nwi= nwi*10+s[i]-'0';
        }
    }
    if(prev == '+'){
        cout << previ+nwi << endl;
    }else{
        cout << previ*nwi << endl;
    }
}