#include <iostream>

int main()
{
    char s[101];
    std::cin >> s;
    
    int l = 0, r = 0;
    int op = 0, opp = 1;
    for(int i = 0;; i++)
    {
        if(s[i] == '*')
        {
            op = 1;
        }
        if(s[i] == '+')
        {
            op = 2;
        }
        if(s[i] == 0)
        {
            op = -1;
        }
        
        if(op == 0)
        {
            r *= 10;
            r += s[i] - '0';
        }
        else
        {
            switch(opp)
            {
                case 1: l += r; break;
                case 2: l *= r; break;
            }
            
            r = 0;
            opp = op;
            op = 0;
        }
        
        if(opp == -1)
            break;
    }
    
    std::cout << l << std::endl;
    
    return 0;
}