#include<iostream>
using namespace std;
string s;
main()
{
	cin>>s;
	int i=0,A=0,B=0;
	bool a,b,c;
	a=s[i]=='+'?i++,1:s[i]=='-'?i++,0:1;
	while(s[i]>='0'&&s[i]<='9')
	{
		A=A*10+s[i]-48;
		i++;
	}
	b=s[i++]=='+';
	c=s[i]=='+'?i++,1:s[i]=='-'?i++,0:1;
	while(s[i]>='0'&&s[i]<='9'){
		B=B*10+s[i]-48;
		i++;
	}
	cout<<A*(a?1:-1)+(b?-1:1)*B*(c?1:-1)<<endl;
}