#include <iostream>
#include <vector>
using namespace std;
using ll = long long;

int main(){
    ll n;
    cin >> n;
    vector<ll> a(n);
    for(int i = 0; i < n; i++){
        cin >> a[i];
    }
    ll cnt = 0;
    bool ok = true;
    for(int i = n - 1; i >= 0; i--){
        if(a[i] > i + 1){
            cout << "No" << endl;
            return 0;
        }
        if((cnt + a[i]) == 0) continue;
        if((cnt + a[i]) % (i + 1) == 0){
            cnt += (a[i] + cnt) / (i + 1);
        }
        else{
            ok = false;
            break;
        }
    }
    if(ok) cout << "Yes" << endl;
    else cout << "No" << endl;
}