#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, x;
  cin >> n >> x;
  int s = 0;
  for (int i = 0; i < n; ++i) {
    int a;
    cin >> a;
    s += a;
  }
  s += n - 1;
  if (s == x) {
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
  return 0;
}
