#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> P;

int main(void){
	string s;
	cin >> s;
	vector<string> vs(3);
	int ix = 0;bool op = true;
	for(int i=0;i<s.size();i++){
		vs[ix] += s[i];
		if(i != s.size()-1 && (s[i+1] == '+' || s[i+1] == '-') && isdigit(s[i]))ix++;
		if(i!=0&& i != s.size()-1 && (s[i] == '+' || s[i] =='-') &&  
			((s[i+1] == '+' || s[i+1] == '-') || isdigit(s[i+1])) && op){
			ix++;
			op = false;
		}
	}
	if(vs[1] == "+"){
		cout << stoi(vs[0])-stoi(vs[2]) << endl;
	}else{
		cout << stoi(vs[0])+stoi(vs[2]) << endl;
	}
	//cout << vs[0] << " " << vs[1] << " " << vs[2] << endl;
	return 0;
}