#include <stdio.h>

int main(void){
	int i,n, m;
	int sum = 0;
	int count = 0;
	scanf("%d", &n);
	scanf("%d", &m);
	int a[n];
	for (i = 0; i < n;++i) {
		scanf("%d", &a[i]);
		sum += a[i];
	}
	double b = (double)sum / (double)(4 * m);
	for (i = 0; i < n;++i) {
		if((double)a[i] >=b) {
			count++;
		}
	}
	if(count >= m) {
		puts("Yes");
	}
	else {
		puts("No");
	}
	return 0;
}