#include <bits/stdc++.h>
using namespace std;
 
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	
	string s; cin >> s;
	bool minus1 = false, minus2 = false;
	int i = 0;
	if(s[i] == '-') {
		i++;
		minus1 = true;
	}
	bool add = true;
	string tmp1, tmp2;
	while(s[i] != '+' && s[i] != '-'){
		tmp1 += s[i];
		i++;
	}
	if(s[i] == '+') {
		add = false;
	}
	i++;
	if(s[i] == '-') {
		minus2 = true;
		i++;
	}
	while(i < s.size()) {
		tmp2 += s[i];
		i++;
	}
	int a = stoi(tmp1), b = stoi(tmp2);
	if(minus1){
		a = -1 * a;
	}
	if(minus2){
		b = -1 * b;
	}
	if(add) cout << a + b << endl;
	else cout << a - b << endl;
	
	return 0;                                              
}