#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<cctype>
#include<climits>
#include<iostream>
#include<string>
#include<vector>
#include<map>
//#include<list>
#include<queue>
#include<deque>
#include<algorithm>
//#include<numeric>
#include<utility>
#include<complex>
//#include<memory>
#include<functional>
#include<cassert>

const int dx[] = {1, 0, -1, 0};
const int dy[] = {0, 1, 0, -1};
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef pair<int, int> pii;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
	string s;
	cin >> s;
	int x, y;
	int n = s.size();
	int op = 0;
	for (int i = 1; i < n-1; i++) {
		if (!isdigit(s[i])) {
			op = i;
			break;
		}
	}
	x = stoi(s.substr(0, op));
	y = stoi(s.substr(op+1, n-op));
	if (s[op] == '+') cout << x-y << endl;
	else cout << x+y << endl;
    return 0;
}