#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <numeric>
#include <math.h>

using namespace std;

#define REP(i,n)	for(int i=0;i<(n);++i)
#define REPS(i,s,t)	for(int i=(s);i<(t);++i)

#define INF 		2000000007
#define MOD			1000000007
#define MAX 		200005


typedef unsigned int 			uint;
typedef unsigned long long int	ull;
typedef long long int ll;

//ull dp[MAX];
string N;

int exp(int *n){
	int ans = 0;
	while(N[++*n] != ')'){
		if(N[*n] == '+'){
			ans += N[++*n]-'0';
		}
		else if(N[*n] == '-'){
			ans -= N[++*n]-'0';
		}
		else
			ans += N[*n]-'0';
	}
	return ans;
}

int main(){
	cin>>N;
	int ans = 0;

	int t;
	REP(i,N.size()){
		if(N[i] == '('){
			t = exp(&i);
		}
		else if(N[i] == '+')
			if(N[++i] == '(')
				ans += exp(&i);
			else
				ans += N[i]-'0';
		else if(N[i] == '-')
			if(N[++i] == '(')
				ans -= exp(&i);
			else
				ans -= N[i]-'0';
		else{
			ans += N[i]-'0';
		}
	}
	cout << ans << endl;

	return 0;
}