#include<iostream>
using namespace std;
class A{
    private:
    int n;
    
    public:
    void setN(int n){
        this->n=n;
    }
    int getN(){
        return 0;
    }
};
int main(){
    int n;
    cin>>n;
    if(n<1 || n>1000){
        cout<<"Invalid input";
        return 0;
    }
    A obj;
    obj.setN();
    cout<<obj.getN();
    return 0;
}