#include <bits/stdc++.h>
using namespace std;

int pos = 0;
string t;

int eval();

int half() {
    int temp = 0;
    if(t[pos]=='(') {
        pos++;
        temp = eval();
        pos++;
    }
    else while(t[pos] >= '0' and t[pos] <= '9') temp = temp * 10 + (t[pos++] - '0'); 
    return temp;
}

int eval() {
    int temp = half();
    while(t[pos]=='m' or t[pos]=='M') 
        t[pos++] == 'm' ? temp = min(temp, half()) : temp = max(temp, half());
    return temp;
}

int main() {
    ifstream f("emm.in");
    ofstream g("emm.out");

    f >> t;
    g << eval();
    return 0;
}