#include<bits/stdc++.h>
using namespace std;
int main(){
	char a=0,b=0,c=0;
	char h=0,d=0;
	cin>>a;
	if(a!='?'){
		int(a);
//		cout<<int(a)<<endl;
	if(cin>>h&&h=='+'){
		if(cin>>b&&b!='?'){
			cin>>d;
			cin>>c;
			cout<<int(a)+int(b)<<endl;
		}
		else{
		      cin>>d;
			  cin>>c;
			  cout<<int(c)-int(a)<<endl;
		    }
	}
   }
   else
   {
   	if(cin>>h&&h=='+'){
   		    cin>>b;
			cin>>d;
			cin>>c;
			cout<<int(c)-int(b)<<endl;
		}
	if(cin>>h&&h=='-'){
   		    cin>>b;
			cin>>d;
			cin>>c;
			cout<<int(c)+int(b)<<endl;
		}
   }
   return 0;
}