#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;
using ld=long double;
ld pie=3.14159265359;
ll inf=80010010;
ll mod=1000000007;
int main(){
    ll n;
    cin >> n;
    vector<ll>a(n+1);
    for (ll i = 1; i <= n; i++)
    {
        cin >> a[i];
    }
    ll now=0;
    bool ok=true;
    for (ll i = n; i >=1; i--)
    {
        if (a[i]>i)
        {
            ok=false;
            break;
        }
        if ((a[i]+now)%i!=0)
        {
            ok=false;
            break;
        }else{
            now+=(a[i]+now)/i;
        }
    }
    if (ok)
    {
        cout << "Yes" << endl;
    }else{
        cout << "No" << endl;
    }
    
}