#include<stdio.h>
#include <stdlib.h>
#include<string.h>
#include<math.h>
#define loop(i, l, r) for(i=l; i<r; i++)/*Instead of function, (for).*/
#define rep(i,r) for(i=0; i<r; i++)
#define Max(a, b) ((a) > (b) ? (a) : (b))
#define Min(a, b) ((a) < (b) ? (a) : (b))
typedef long long int lli;
/*Return Combination ,(nCr)*/
int combi(int n, int r)
{
	if(r==0 || r==n) return 1;
	else return combi(n-1,r) + combi(n-1,r-1);
}
/*Return gcd(a, b)*/
int gcd(int a, int b){
	if(b == 0) return a;
	else return gcd(b, a % b);
}
//qsort�֐��Ɏg��compare�֐�,(long long int, int, double�^)
int compare_lli(const void *a, const void *b)
{
    return *(lli*)a - *(lli*)b;
}
int compare_int(const void *a, const void *b)
{
    return *(int*)a - *(int*)b;
}
int compare_double(const void *a, const void *b)
{
    return *(double*)a - *(double*)b;
}
/*qsort(data, 10, sizeof(int_lli_double), compare_int);*/
/*qsort(�z��, �v�f��, sizeof(�z��̌^), compare_�z��̌^);*/
int chek(int *tmp1, int *tmp2, int n){
	int i;
	for(i=0; i<n; i++){
		if(tmp1[i] != tmp2[i]){
			return 1;
		}
	}
	return 0;
}//2�̔z�񂪈�v���邩�̔���_(return��v��0,�s��v���P)
int main(void)
{
	int n, m, i, k=0, sum=0;
	scanf("%d%d", &n, &m);
	int a[n];
	rep(i,n){
		scanf("%d", &a[i]);
		sum += a[i];
	}
	rep(i,n){
		if(a[i] >= sum/(4*m)) k++;
	}
	if(k>=m) puts("Yes");
	else puts("No");
	return 0;
}