#include <bits/stdc++.h>
typedef long long ll;
const int INF = 1e9,MOD = 1e9+7,ohara = 1e6;
const ll LINF = 1e18;
using namespace std;

#define rep(i,n) for(ll (i)=0;(i)<(int)(n);(i)++)
#define rrep(i,a,b) for(ll i=(a);i<(b);i++)
#define rrrep(i,a,b) for(ll i=(a);i>=(b);i--)
#define all(v) (v).begin(), (v).end()
#define pb(q) push_back(q)
#define Size(n) (n).size()
#define Cout(x) cout<<(x)<<endl

ll n,cnt=0,ans=0,a,b=1,c=1,d,cmp,cmpp,m,h,w,sum=0,pos,xx,yy;
int dy[]={1,0,-1,0};
int dx[]={0,1,0,-1};
//int dy[]={-1,0,1,-1,1,-1,0,1};
//int dx[]={-1,-1,-1,0,0,1,1,1};
string alph("abcdefghijklmnopqrstuvwxyz"),s,x,y;
bool fl;
struct edge{int to,cost;};

//-------------------------↓↓↓↓↓↓------------------------

int main(void){
       cin.tie(0);
    ios::sync_with_stdio(false);
      
    cin>>s;
    cnt=0;
    if(s[0]=='+')cnt=1,b=1;
    else if(s[0]=='-')cnt=1,b=-1;
    rrep(i,cnt,Size(s)){
        if(s[i]=='+'){
            cnt=i+1;
            a=-1;
            break;
        }
        else if(s[i]=='-'){
            cnt=i+1;
            a=1;
            break;
        }
        x+=s[i];
    }
    if(s[cnt]=='+')cnt++,c=1;
    else if(s[cnt]=='-')cnt++,c=-1;
    rrep(i,cnt,Size(s)){
        y+=s[i];
    }
    xx=atoi(x.c_str());
    yy=atoi(y.c_str());
    xx*=b;
    yy*=c;
    if(a==-1){
        Cout(xx-yy);
    }
    else Cout(xx+yy);

    return 0;
}