#include<iostream>
using namespace std;
int main()
{
    char ch;
    cin>>ch;
    int num1,num2;
    cin>>num1>>num2;
    switch(ch)
    {
        case'+':
        cout<<num1+num2;
        break;
        case'-':
        cout<<num1-num2;
        break;
        case'+':
        cout<<num1-num2;
        break;
        case'+':
        cout<<num1-num2;
        break;
        default:
        cout<<"Invalid input";
    }
    return 0;
}