#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <climits>
#include <cmath>
#include <string>
#include <vector>
#include <algorithm>
#include <queue>
#include <map>
#include <functional>
#include <set>
#include <numeric>
#include <stack>
#include <utility>
#include <time.h>
//#include "util.h"

using namespace std;
typedef unsigned uint;
typedef long long ll;
typedef unsigned long long ull;



//呪文
template <typename _KTy, typename _Ty> ostream& operator << (ostream& ostr, const pair<_KTy, _Ty>& m) { cout << "{" << m.first << ", " << m.second << "}"; return ostr; }
template <typename _KTy, typename _Ty> ostream& operator << (ostream& ostr, const map<_KTy, _Ty>& m) { if (m.empty()) { cout << "{ }"; return ostr;	} cout << "{" << *m.begin(); for (auto itr = ++m.begin(); itr != m.end(); itr++) { cout << ", " << *itr; } cout << "}"; return ostr; }
template <typename _Ty> ostream& operator << (ostream& ostr, const vector<_Ty>& v) { if (v.empty()) { cout << "{ }"; return ostr; }	cout << "{" << v.front(); for (auto itr = ++v.begin(); itr != v.end(); itr++) { cout << ", " << *itr; }	cout << "}"; return ostr; }
template <typename _Ty> ostream& operator << (ostream& ostr, const set<_Ty>& s) { if (s.empty()) { cout << "{ }"; return ostr; } cout << "{" << *(s.begin()); for (auto itr = ++s.begin(); itr != s.end(); itr++) { cout << ", " << *itr; }	cout << "}"; return ostr; }
#define PI 3.14159265358979323846
#define EPS 1e-6
#define MIN(a,b) ((a)<(b)?(a):(b))
#define MAX(a,b) ((a)>(b)?(a):(b))
#define all(x) (x).begin(), (x).end()



bool is_digit(char c)
{
	if ('0' <= c && c <= '9')
		return true;
	return false;
}

int parse_int(string& S, int& pos)
{
	int ret = 0;
	while (pos != S.size() && is_digit(S[pos])) {
		ret *= 10;
		ret += S[pos] - '0';
		pos++;
	}
	return ret;
}

int yuki0222()
{
	string S;
	cin >> S;

	char op[3] = { 0 };
	int x, y, pos, ans;

	pos = 0;
	// x の符号
	if (!is_digit(S[pos])) {
		op[0] = S[pos];
		pos++;
	}
	// x 読み込み
	x = parse_int(S, pos);
	// 符号マイナスなら -1 をかける
	if (op[0] == '-') x *= -1;
	// operator 読み込み
	op[1] = S[pos];
	pos++;
	// y の符号
	if (!is_digit(S[pos])) {
		op[2] = S[pos];
		pos++;
	}
	// y 読み込み
	y = parse_int(S, pos);
	// 符号マイナスなら -1 をかける
	if (op[2] == '-') y *= -1;

	// あべこべ
	ans = (op[1] == '+' ? x - y : x + y);

	cout << ans << endl;

	return 0;
}

int main()
{
	//clock_t start, end;
	//start = clock();

	yuki0222();
	
	//end = clock();
	//printf("%d msec.\n", end - start);

	return 0;
}