#include <iostream>
#include <stack>

int main()
{
    char s[101];
    std::cin >> s;
    
    int ans = 0;
    int temp = 0;
    int sign = 0;
    int tsign = 0;

    for(int i = 0; s[i]; i++)
    {
        if((s[i] > '0') && (s[i] < '9'))
            s[i] -= '0';
            
        if(s[i] <= 9)
        {
            switch(sign)
            {
                case  0: ans  = s[i]; break;
                case  1: ans += s[i]; break;
                case -1: ans -= s[i]; break;
            }
            sign = 0;
        }
        if(s[i] == '+')
            sign = 1;
        if(s[i] == '-')
            sign = -1;
        
        if(s[i] == '(')
        {
            temp = ans;
            tsign = sign;
            sign = 0;
        }
        if(s[i] == ')')
        {
            ans = temp + (tsign * ans);
        }
    }

    
    std::cout << ans << std::endl;
    
    return 0;
}