#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)
#define all(x) (x).begin(), (x).end()
using ll = long long;
const ll MOD = 998244353;
#include<atcoder/all>
using namespace atcoder;
using mint = modint998244353;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  ll n; cin >> n;
  vector<ll> A(n);
  rep(i, n+1) cin >> A[i];
  ll a=0,b=0;
  for(ll i=2;i<=n;i++){
    a+=A[i]*i;
    b+=A[i];
  }
  if(a-b<A[1]&&A[1]<=a){
    cout << "Yes" << endl;
  }else{
    cout << "No" << endl;
  }
}