from fractions import Fraction

n,m=list(map(int,input().split()))

a=list(map(int,input().split()))



cnt=0



for i in a:

	if (sum(a))*(Fraction(1,4*m))<=i:

		cnt+=1

		if cnt==m:

			print("Yes")

            

if cnt<m:

	print("No")
n,m=list(map(int,input().split()))

a=list(map(int,input().split()))

 

cnt=0

 

for i in a:

	if (sum(a)/(4*m))<=i:

		cnt+=1

		if cnt==m:

			print("Yes")

            

if cnt<m:

	print("No")
from fractions import Fraction

n, m = list(map(int, input().split()))
a = list(map(int, input().split()))
cnt = 0
for i in a:
    if (sum(a)) * (Fraction(1, 4 * m)) <= i:
        cnt += 1
        if cnt == m:
            print("Yes")
if cnt < m:
    print("No")

n, m = list(map(int, input().split()))
a = list(map(int, input().split()))
cnt = 0
for i in a:
    if (sum(a) / (4 * m)) <= i:
        cnt += 1
        if cnt == m:
            print("Yes")
if cnt < m:
    print("No")

-from fractions import Fraction - -    if (sum(a)) * (Fraction(1, 4 * m)) <= i: +    if (sum(a) / (4 * m)) <= i: