#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>

//#include<bits/stdc++.h>



using namespace std;




int main() {
	int x=0,y=0;
	string p;
	bool a=0,b=0;
	cin>>p;int s=0;
	for(int i=0;i<p.size();i++){
		if(!i&&p[i]=='-')a=1;
		if(!s){
			if(p[i]!='+'&&p[i]!='-'){
				x*=10;
				x+=p[i]-='0';
			}
			else if(i){s++;if(p[i]=='+')b=1;}
			
		}
		else{
			if(p[i]!='+'&&p[i]!='-'){
				y*=10;
				y+=p[i]-='0';
			}
			else if(p[i]=='-'){
				if(b)b=0;
				else b=1;
			}
		}
		
	}
	//	cout<<x<<" "<<y<<endl;
	
	if(a)x*=-1;
	if(b)y*=-1;
	cout<<x+y<<endl;
	
	return 0;
}