#include<stdio.h>
#define in(x) scanf("%d", &x)
#define out(x) printf("%d", x)


int main(void) {
	int n, m, ans = 0, sum  = 0; 
	in(n); in(m);
	int a[n];
	for(int it = 0; it < n; ++it) {
		in(a[it]); 
		sum += a[it]; 
	}
	for(int it = 0; it < n; ++it) {
		if((float)a[it] >= (float) sum / (4 * m))
			++ans;
	}
	if(ans >= m) 
		printf("Yes\n");
	else 
		printf("No\n"); 	
	return 0;	
}