#include <bits/stdc++.h>
using namespace std;
inline int read(){
	int x=0,f=1;char ch=getchar();
	while(ch>'9'||ch<'0')ch=='-'&&(f=0)||(ch=getchar());
	while(ch<='9'&&ch>='0')x=(x<<3)+(x<<1)+ch-'0',ch=getchar();
	return f?x:-x;
}

int a[100020];

int main() {
  int n = read(), m = read();
  for (int i = 1; i <= n; ++ i) {
    a[i] = read();
  }

  sort(a + 1, a + n + 1);
  long long d = 0;
  for (int i = 1; i <= n; ++ i) {
    d += (long long) a[i] * (n - i + 1);
  }

  puts(d >= m ? "Yes" : "No");
}