#include<stdio.h>

int main(void){
    int n,m,i,k,c=0,sum=0;
    int v[200];
    (void)scanf("%d %d",&n,&m);
    for(i=1;i<=n;i++){
        (void)scanf("%d",&k);
        v[i]=k;
        sum+=k;
    }

    for(i=1;i<=n;i++){
        if(4*v[i]*m>=sum)c++;
    }

    if(c>=m){
        printf("Yes\n");
    }else{
        printf("No\n");
    }
    return 0;
}