#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX 100

int cmpfunc( const void * n1, const void * n2)
{
    if      (*(int *)n1 < *(int *)n2)  return  1;
    else if (*(int *)n1 > *(int *)n2)  return -1;
    else                               return 0;
}

int main()
{
    int n, m;
    int a[MAX];
    
    scanf("%d%d",&n,&m);
    for (int i=0; i<n; i++) scanf("%d",&a[i]);
    
    qsort(a, n, sizeof(a[0]), cmpfunc);
    //for ( int i=0; i<n; i++) printf("%d ",a[i]);
    //printf("\n");
    
    int total = 0;
    for (int i=0; i<n; i++){
        total += a[i];
    }
    
    //printf("total = %d, total/4M = %lf", total, (double)(total)/(double)(4*m));
    
    if (a[m-1] < (double)(total)/(double)(4*m)){
        printf("No\n");
        return 0;
    } else {
        printf("Yes\n");
        return 0;
    }
}
