#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000


int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
	string S; cin >> S;
	string x, y;
	int i = 1;
	x += S[0];
	while ('0' <= S[i] && S[i] <= '9') {
		x += S[i];
		i++;
	}
	int j = i + 1;
	while (j < S.length()) {
		y += S[j];
		j++;
	}
	int numx = stoi(x);
	int numy = stoi(y);
	if (S[i] == '+') {
		cout << numx - numy << endl;
	}
	else {
		cout << numx + numy << endl;
	}


    return 0;
}