#include <bits/stdc++.h>
#define LL long long
using namespace std;
const int N = 1e5 + 101;
int n, m, t[N];
LL c, nowtim;

signed main()
{
	scanf("%d%d",&n,&m);
	for(int i = 1;i <= n; i++) scanf("%d",&t[i]);
	sort(t + 1,t + n + 1);
	for(int i = 1;i <= n; i++)
	    nowtim += (LL)(n - i + 1) * (LL)t[i];
	if(nowtim >= m) puts("Yes");
	else puts("No"); 
}