#include<stdio.h>

int main(int argc, char const *argv[])
{
	int n,m,i,t=0,r=0;
	int a[100]={0};
	double b;

	scanf("%d%d",&n,&m);

	for(i=0;i<n;i++){
		scanf("%d",&a[i]);
		t+=a[i];
	}

	b=1/(4*m)*t;

	for(i=0;i<n;i++){
		if(a[i]>=b)
			r++;
	}

	if(r>=m){
		printf("Yes");
	}else{
		printf("No");
	}

	return 0;
}