// editor2
#include <iostream>
using namespace std;
int main(){
    char op;
    int a,b;
    cin>>op;
    cin>>a>>b;
    switch(op){
        case '+': cout<<a+b;break
        case '-': cout<<a-b;break
        case '*': cout<<a*b;break
        case '/':
        if(b==0){
            cout<<"Invalid input";}
        else{
            cout<<a/b;break}
        default:
        cout<<"invalid input";
    }
    return 0;
}