#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int n, net, i, flag, d;
  string str;
  cin >> n;
  net = 0;
  flag = 0;
  for (i = 0; i < n; i++) {
    cin >> d;
    cin >> str;
    if ((net == 0) && (str != "South")) flag = 1;
    if ((net == 20000) && (str != "North")) flag = 1;
    if (str == "South")
      net += d;
    else if (str == "North")
      net -= d;
    if (net > 20000 || net < 0) flag = 1;
  }
  if (net != 0) flag = 1;
  if (flag == 1)
    cout << "NO\n";
  else
    cout << "YES\n";
  return 0;
}
