// editor5
#include<iostream>
#include<string>
#include<stdexcept>
using namespace std;
int main(){
    try{
        string aStr,bStr;
        cin>>aStr>>bStr;
        
        int a=stoi(aStr);
        int b=stoi(bStr);
        
        if(b == 0)
        throw runtime_erroe("Division by zero is not allowed.");
        
        cout<<a/b;
    }
    catch(invalid_argument&){
        cout<<"Invalid input";
    }
    catch(runtime_error& e){
        cout<<e.what();
    }
    catch(...){
        cout<<"Invalid input";
    }
    return 0;
}