#include<iostream>
#include<cstdio>
#include<vector>
#include<queue>
#include<map>
#include<string>
#include<algorithm>
#include<functional>
using namespace std;
#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n) for (int i=0;i<(n);i++)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)
#define INF 1<<30
#define MP make_pair
#define mp make_pair
#define pb push_back
#define PB push_back
#define DEBUG(x) cout<<#x<<": "<<x<<endl
#define ll long long
#define ull unsigned long long
int main(){
	string str;
	cin>>str;
	ull it;
	it=str.find_first_of("1234567890",0);
	it=str.find_first_not_of("1234567890",it);
	int a=stoi(string(str.begin(),str.begin()+it));
	int b=stoi(string(str.begin()+it+1,str.end()));
	if(str[it]=='+'){
		cout<< a-b<<endl;
	}
	if(str[it]=='-') {
		cout<<a+b<<endl;
	}
	return 0;
}