#include <bits/stdc++.h>
using namespace std;
int main(){
	string s;	cin>>s;
	int x=0,y=0;
	bool ope,xy=true,opeal=true;
	string temp;
	for(int i=0;i<(int)s.size();i++){
		if(i>0&&s[i]=='+'&&opeal){
			ope=true;	xy=false;	opeal=false;
		}
		else if(i>0&&s[i]=='-'&&opeal){
			ope=false;	xy=false;	opeal=false;
		}
		else if('0'<=s[i]&&s[i]<='9'&&xy){
			temp=s[i];
			x=x*10+atoi(temp.c_str());
		}
		else if('0'<=s[i]&&s[i]<='9'){
			temp=s[i];
			y=y*10+atoi(temp.c_str());
		}
	}
	if(s[0]=='-')	x*=-1;
	int cnt=1;
	while(s[cnt]!='+'&&s[cnt]!='-')	cnt++;
	if(s[cnt+1]=='-')	y*=-1;
	if(ope)	cout<<x-y<<endl;
	else 	cout<<x+y<<endl;
	return 0;
}