#include<iostream>
using namespace std;
int N;
int A[2<<17];
main()
{
	cin>>N;
	for(int i=1;i<=N;i++)
	{
		cin>>A[i];
		if(A[i]>i)
		{
			cout<<"No"<<endl;
			return 0;
		}
	}
	long s=0;
	for(int i=N;i;i--)
	{
		if((s+A[i])%i)
		{
			cout<<"No"<<endl;
			return 0;
		}
		s+=(s+A[i])/i;
	}
	cout<<"Yes"<<endl;
}