#include <bits/stdc++.h>
#define REP(i,n,N) for(int i=(n);i<(int) N;i++)
#define p(s) cout<<(s)<<endl
using namespace std;

int main(){
	string s;
	cin>>s;
	int ans=0;
	REP(i,0,s.size()){
		rotate(s.begin(),s.begin()+1,s.end());
		if(!isdigit(s[0])||!isdigit(s.back())) continue;
		int tmp=0;
		int mx=0;
		bool hugo=0;
		bool number=0;
		REP(j,0,s.size()){
			if(isdigit(s[j])){
				tmp*=10;
				tmp+=s[j]-'0';
				number=1;
			}else {
				if(number==0){
					mx=0;
					break;
				}else if(hugo==0)	mx+=tmp;
				else	mx-=tmp;
				tmp=0;
				if(s[j]=='+')	hugo=0;
				else if(s[j]=='-') hugo=1;

			}
		}
		if(number){
			if(hugo==0)	mx+=tmp;
			else	mx-=tmp;
		}
		ans=max(ans,mx);
	}
	p(ans);
	return 0;
}