#include <fstream>
#include <string>

using namespace std;

string s;
int p;

ifstream in("emm.in");
ofstream out("emm.out");

int expresie();
int factor();

int expresie()
{
    int rez = factor();
    while (s[p] == 'm' || s[p] == 'M')
    {
        if (s[p] == 'm')
        {
            p++;
            rez = min(rez, factor());
        }
        else
        {
            p++;
            rez = max(rez, factor());
        }
    }
    return rez;
}

int factor()
{
    int val = 0, semn = 1;
    while (s[p] == '-')
    {
        p++;
        semn = -semn;
    }
    if (s[p] == '(')
    {
        p++;///pentru (
        val = expresie();
        p++;///pentru )
        return semn * val;
    }
    while (s[p] >= '0' && s[p] <= '9')
    {
        val = val * 10 + (s[p] - '0');
        p++;
    }
    return semn * val;
}

int main()
{
    in >> s;
    in.close();
    out << expresie();
    out.close();
    return 0;
}