#include <iostream>
#include <string>
#include <utility>

int main(){
    std::string s;
    std::cin >> s;
    
    int n = 0;
    int sum = 0;
    for(auto const c : s){
        if( c >= '0' && c <= '9'){
            n *= 10;
            n += std::stoi(std::string(1, c));
        }
        else{
            if(c=='+'){
                sum += n;
            }
            else if(c=='-'){
                sum *= n;
            }
            n = 0;
        }
    }
    std::cout << sum << std::endl;
    
}