#include <iostream>
using namespace std;
int main()
{
    int x,y;
    cin>>x;
    if(x>=10)
    {
        y=x-1;
        cout<<"y"<<y<<endl;
    }
    else if(1<x<10)
    {
        y=2*x+1;
        cout<<"y"<<y<<endl;
    }
    else if(x<=1)
    {
        y=x-1;
        cout<<"y"<<y<<endl;
    }
	return 0;
}