#include <stdio.h>
#include <stdlib.h>
#define N 1000

int cmp(const void* a,const void* b)
{
	return *(int*)a - *(int*)b;
}

int main(void)
{
	int a[N] = { 0 };
	int n;
	int i;
	long long int m;
	scanf("%d%lld", &n, &m);
	for (i = 0; i < n; i++)
		scanf("%d", &a[i]);
	qsort(a, n, sizeof(int), cmp);
	long long int sum = 0;
	for (i = 0; i < n; i++)
		sum += (-(long long int)i + n) * a[i];
	if (sum >= m)
		printf("Yes");
	else
		printf("No");
}