#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> VI;
#define REP(i, n) for(int(i)=0;(i)<(n);++(i))
#define in(T,V) T V;cin>>V;
const int MOD = int(1e9+7);

char getop(string::const_iterator &it){
    if(*it == '-' || *it == '+'){
        return *it++;
    }
    return '+';
}
int getnum(string::const_iterator &it){
    int n = 0;
    while(isdigit(*it)){
        char c = *it++;
        n = n * 10 + (c - '0');
    }
    return n;
}

int main(){
    in(string,s);
    auto it = s.cbegin();

    auto op1 = getop(it);
    auto num1 = getnum(it);
    auto op = getop(it);
    auto op2 = getop(it);
    auto num2 = getnum(it);
    if(op1 == '-') num1 = -num1;
    if(op2 == '-') num2 = -num2;
    if(op  == '+') num2 = -num2;

    cout << num1 + num2 << endl;
}