#include <stdio.h>

int main(void) {
	int N, M;
	int A[128];
	int i;
	int wa = 0;
	int kaunto = 0;
	if (scanf("%d%d", &N, &M) != 2) return 1;
	for (i = 0; i < N; i++) {
		if (scanf("%d", &A[i]) != 1) return 1;
		wa += A[i];
	}

	for (i = 0; i < N; i++) {
		if (A[i] * 4 * M >= wa) kaunto++;
	}
	puts(kaunto >= M ? "Yes" : "No");
	return 0;
}
