#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MX=2e5+3;
int n;//k,t=0;
int lat=0,longt=0;
int main()
{
    cin>>n;
    for(int i=0;i<n;i++)
    {
     int a;
     string b;
     cin>>a>>b;
     if(longt==0)
     {
         if(b!="South")
         {
             cout<<"NO";
             return 0;
         }
     }if(longt==20000)
     {
         if(b!="North")
         {
             cout<<"NO";
             return 0;
         }
     }
    if(b=="South")longt+=a;
    if(b=="North")longt-=a;

if(longt<0||longt>20000)
    {
        cout<<"NO";
        return 0;
    }
    }
    //cout<<lat<<' '<<longt<<'$';
    if(longt==0)
    {
        cout<<"YES";
    }
    else cout<<"NO";
    return 0;
}