#include <bits/stdc++.h> using namespace std; #define all(c) (c).begin(),(c).end() #define rrep(i,n) for(int i=(int)(n)-1;i>=0;i--) #define REP(i,m,n) for(int i=(int)(m);i<(int)(n);i++) #define rep(i,n) REP(i,0,n) #define iter(c) __typeof((c).begin()) #define tr(it,c) for(iter(c) it=(c).begin();it!=(c).end();it++) #define mem(a) memset(a,0,sizeof(a)) #define pb(a) push_back(a) #define in(a) insert(a) #define R cin>> #define F first #define S second #define C class #define ll long long #define ln cout<<'\n' #define _(_1,_2,_3,N,...)N #define pr(...) _(__VA_ARGS__,pr3,pr2,pr1)(__VA_ARGS__) template<C T>void pr1(T a){cout<<a;ln;} template<C T,C T2>void pr2(T a,T2 b){cout<<a<<' '<<b;ln;} template<C T,C T2,C T3>void pr3(T a,T2 b,T3 c){cout<<a<<' '<<b<<' '<<c;ln;} template<C T>void PR(T a,int n){rep(i,n){if(i)cout<<' ';cout<<a[i];}ln;} bool check(int n,int m,int x,int y){return x>=0&&x<n&&y>=0&&y<m;} const ll MAX=1000000007,MAXL=1LL<<60,dx[4]={-1,0,1,0},dy[4]={0,1,0,-1}; typedef pair<int,int> P; void Main() { string s; cin >> s; REP(i,1,s.size()) { if(isdigit(s[i-1])) { if(s[i]=='+') s[i]='-'; else if(s[i]=='-') s[i]='+'; } } s='+'+s; s+='='; int ans=0,p=1,d=0; rep(i,s.size()) { if(isdigit(s[i])) { d*=10; d+=s[i]-'0'; } else { ans+=p*d; d=0; if(s[i]=='+') { p=1; if(s[i-1]=='-') p=-1; } else if(s[i]=='-') { p=-1; if(s[i-1]=='-') p=1; } } } pr(ans); } int main() { ios::sync_with_stdio(0);cin.tie(0);Main(); return 0; }