#include "bits/stdc++.h" using namespace std; typedef long long ll; #define rep(i,l,r) for(int i=(l);i<(r);i++) #define fcout cout << fixed << setprecision(10) int main(){ string s; cin>>s; int ans = 0,minus=1,reverse=1; while (s.size()) { if(s.front()=='+'); else if(s.front()=='-')minus=-1; else if(s.front()=='('){ reverse=minus; minus=1; } else if(s.front()==')')reverse=1; else{ ans+=(s.front()-'0')*minus*reverse; minus=1; } s.erase(s.begin()); } cout<<ans; }