#include<bits/stdc++.h>
using namespace std;
#define int long long
#define rep(i,n) for(int i=0;i<(n);i++)
#define REP(i,a,b) for(int i=(a);i<(b);i++)
#define pb push_back
#define all(v) (v).begin(),(v).end()
typedef vector<int>vi;

signed main(){
    string s;
    cin>>s;
    int a=1,b=1;
    if(!isdigit(s[0])){
        if(s[0]=='-')a*=-1;
        s=s.substr(1,s.size()-1);
    }
    {
        int cur=0,sum=0;
        while(isdigit(s[cur])){
            sum=sum*10+s[cur]-'0';
            cur++;
        }
        a*=sum;
        s=s.substr(cur,s.size()-cur);
    }

    if(s[0]=='+')b*=-1;
    s=s.substr(1,s.size()-1);
    if(!isdigit(s[0])){
        if(s[0]=='-')b*=-1;
        s=s.substr(1,s.size()-1);
    }
    int sum=0;
    rep(i,s.size())sum=sum*10+s[i]-'0';
    b*=sum;
    cout<<a+b<<endl;
    return 0;
}