#include<stdio.h>

int main(){
	int N, i = 0, M, sel;
	int s = 0;
	double add;
	scanf("%d %d", &N, &M);
	sel = 0;
	int a[N];
	for(i = 0; i < N; i++){	
		scanf("%d", &(a[i]));
	}
	for(i = 0; i < N; i++){
		s += a[i];
	}
	add = s / (4 * M);
	for(i = 0; i < N; i++){	
		if( add <= a[i]) sel++;
	}
	if(sel >= M){
		printf("Yes\n");
	}else{
		printf("No\n");
	}
	return 0;
}