#include <iostream>

using namespace std;

int main()
{
    ios::sync_with_stdio(false);
    while(true)
    {
        int S;
        cin>>S;
        if(cin.good()==false)
        {
            break;
        }
	string a;
	getline(cin,a);

	//cout<<"|"<<a<<"|"<<endl;
	if(a==" N")
	{
		if(S<3)
			cout<<1<<endl;
		else
			cout<<2<<endl;
	}
	else if(a==" K")
	{
		if(S<2)
			cout<<1<<endl;
		else
			cout<<4<<endl;
	}
	else if(a==" B")
	{
		cout<<S<<endl;
	}
	else if(a==" R")
	{
		cout<<S<<endl;
	}
else	cout<<"Input bug"<<endl;
	


	


    }
    return 0;
}