#include <bits/stdc++.h>
using namespace std;


int main(){
    int n; cin >> n;
    int a[n + 1];
    for (int i = 1; i <= n; ++i) cin >> a[i];
    int times = 0;
    for (int i = n; i >= 1; --i){
        if (a[i] <= i && (a[i] + times)%i==0){
            if (a[i] > 0) ++times;
        }else{
            cout << "No" << endl;
            return 0;
        }
    }
    cout << "Yes" << endl;
    
}