#include <iostream>
using namespace std;
int main() { //文具名字 C++ 6级
	int n;
	cin>>n;
	if(n==1){
		cout<<"pen";
	}else if(n==2){
		cout<<"pincil";
	}else if(n==3){
		cout<<"eraser";
	}else if(n==4){
		cout<<"ruler";
	}else if(n==5){
		cout<<"notebook";
	}else{
		cout<<"error";
	}	
	return 0;
}

#include <iostream>
using namespace std;
int main() { //C++ 6级交通信号
	int n;
	cin>>n;
	switch(n){
		case 1:cout<<"pen";break;
		case 2:cout<<"pencil";break;
		case 3:cout<<"eraser";break;
		case 4:cout<<"ruler";break;
		case 5:cout<<"notebook";break;
		default:cout<<"error";
	}
	return 0;
}