#include <iostream>
#include <cstring>
using namespace std;
int a,rsp,i,n;
string s;
int main()
{
    cin>>n;
    for( i = 1 ; i <= n ; i++ )
    {
        cin>>a>>s;
        if( s == "North" )
            rsp -= a % 40000;
        else if( s == "South")
            rsp += a % 40000;
        else if( rsp == 0 || rsp == 20000 )
        {
            cout<<"NO";
            return 0;
        }
        if( ( s == "South" && rsp - a % 20000 == 20000 ) || ( s == "North" && rsp + a % 20000 == 0 ) )
        {
            cout<<"NO";
            return 0;
        }
    }
    cout<< ( rsp == 0 ? "YES" : "NO" );
}