#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int ns = 0;
  bool ok = true;
  for (int i = 0; i < n; i++) {
    int val;
    cin >> val;
    string type;
    cin >> type;
    if (type == "South") {
      if (ns + val > 20000)
        ok &= false;
      else
        ns += val;
    } else if (type == "North") {
      if (ns - val < 0)
        ok &= false;
      else
        ns -= val;
    } else {
      if (ns == 20000 || ns == 0) ok &= false;
    }
  }
  ok &= ns == 0;
  cout << (ok ? "YES\n" : "NO\n");
  return 0;
}
