#include<iostream>
#include<string>
using namespace std;
int main(){
    string S;
    cin >> S;
    int ans,opi,i=0;
    char op;
    while(S[i] != '*' && S[i] != '+') i++;
    op = S[i];
    opi = i;
    ans = stoi(S.substr(0,i));
    for(i++;i<S.length();i++){
        if(S[i] == '*' || S[i] == '+'){
            if(op == '*') ans += stoi(S.substr(opi+1,i-opi-1));
            else if(op == '+') ans *= stoi(S.substr(opi+1,i-opi-1));
            opi = i;
            op = S[i];
        }
    }
    if(op == '*') ans += stoi(S.substr(opi+1));
    else if(op == '+') ans *= stoi(S.substr(opi+1));
    cout << ans << endl;
    return 0;
}