#include<iostream>
#include<string>
using namespace std;
int main()
{
    string n;
    int a,b;
    cin>>n;
    cin>>a>>b;
    if(n=='+')
    cout<<a+b;
    else if(n=='-')
    cout<<a-b;
    else if(n=='*')
    cout<<a*b;
    else if(n=='/')
    cout<<a/b;
    else
    {
        cout<<"Invalid input";
    }
}