#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>
#include <map>
#include <set>
#include <bitset>
using namespace std;
typedef long long ll;

int main(){
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	string s,t; cin >> s >> t;
	s+=t;
	ll ans=0;
	ll num=0;
	ll sign=1;
	for(char c:s){
		if(c=='-'){
			ans+=sign*num;
			num=0;
			sign=-1;
		}
		else if(c=='+'){
			ans+=sign*num;
			num=0;
			sign=1;
		}
		else{
			num*=10;
			num+=(c-'0');
		}
	}
	ans+=sign*num;
	cout << ans << endl;
}