#include <iostream>

using namespace std;

int main()
{
    int a=0,c=0;
    char b;
    cin>>a>>b;
    if(b == 'y')
    {
        if(a <= 1000)
        {
            cout<<"13";
        }
        else
        {
            if(a%500 != 0)
            {
                c = 13+((((a-1000)/500)+1)*4);
                cout<<c;
            }
            else
            {
                c = 13+(((a-1000)/500)*4);
                cout<<c;
            }
        }
    }
    else if(b == 'n')
    {
        if(a <= 1000)
        {
            cout<<"8";
        }
        else
        {
            if(a%500 != 0)
            {
                c = 8+((((a-1000)/500)+1)*4);
                cout<<c;
            }
            else
            {
                c = 8+(((a-1000)/500)*4);
                cout<<c;
            }
        }
    }
    return 0;
}