#include<iostream>
#include<string>
using namespace std;
int main(){
    string str;
    int x,y,ans,i;
    cin >> str;
    for(i=1;i<str.length();i++){
        if(str[i] == '+' || str[i] == '-') break;
    }
    x = stoi(str.substr(0,i));
    y = stoi(str.substr(i+1));
    if(str[i] == '+') ans = x-y;
    else ans = x+y;
    cout << ans << endl;
    return 0;
}