#include <iostream>

int main(){
    std::string S;
    std::cin >> S;

    int a, first;
    for(int i=0;i<(int)S.size();i++){
        if(S[i] == '+' || S[i] == '*'){a = std::stoi(S.substr(0, i)); first = i; break;}
    }

    for(int i=first+1;i<(int)S.size();){
        while(i < (int)S.size() && S[i] != '+' && S[i] != '*'){i += 1;}
        
        int b = std::stoi(S.substr(first+1, i-(first+1)));
        if(S[first] == '+'){a *= b;}
        else{a += b;}

        first = i;
        i += 1;
    }

    std::cout << a << std::endl;
}