#include <stdio.h>

int main(void){
    int m,n;
    scanf("%d %d", &n,&m);
    int a[n];
    int i;
    for(i=0;i<n;i++){
        scanf("%d",&a[i]);
    }
    int sum=0;
    for(i=0;i<n;i++){
        sum+=a[i];
    }
    int judge=0;
    for(i=0;i<n;i++){
        if(a[i]*4*m>=sum){
            judge++;
        }
    }
    if(judge>=m){
        printf("Yes\n");
    }else{
        printf("No\n" );
    }
    return 0;
}
