#include <cstdio>
#include <stdio.h>
#include <stdbool.h>
#include <iostream>
#include <map>
#include <vector>
#include <climits>
#include <stack>
#include <string>
#include <queue>
#include <algorithm>
#include <set>
#include <unordered_set>
#include <unordered_map>
#include <cmath>
#include <cctype>
#include <bitset>
#include <iomanip>
#include <cstring>
#include <numeric>
#include <cassert>
using namespace std;
#define int long long
#define pii pair<int, int>
#define mp make_pair
#define pb push_back
#define fi first
#define se second
int n, i=0;
string s;
pii calc(){
pii l, r;
if (s[i]=='?')return mp(1ll, n);
char c=s[i+1];
i+=4;
l=calc();
i+=2;
r=calc();
++i;
if (c=='i')return mp(min(l.fi, r.fi), l.se+r.se-n-1);
return mp(l.fi+r.fi, max(l.se, r.se));
}
int32_t main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin>>s;
n=count(s.begin(), s.end(), '?');
pii ans=calc();
cout<<ans.se-ans.fi+1;
}
