#include <stdio.h>
#include <stdlib.h>

int compareInt(const void* a, const void* b)
{
    int aNum = *(int*)a;
    int bNum = *(int*)b;

    return bNum - aNum;
}

int main(void){
    int i,j;
    int x =0;
    int k[100]={0};
    scanf("%d %d", &i,&j);
    for(int l = 0;l<i;l++){
    scanf("%d ",&k[l]);
    x+=k[l];
    }
    
    qsort(k,i,sizeof(int),compareInt);
    
    if(k[j-1]>x/(4*j)){
    printf("Yes");}
    else{
    printf("No");}
    
    return 0;
    
}
