#include <stdio.h>

int main(void){
    int n, i, a[100000], m, b=0;
    
    scanf("%d%d",&n,&m);

    for(i=1;i<=n;i++){
        scanf("%d",&a[i]);
        b+=a[i];
    }
    
    for(i=1;i<=n;i++){
       if(a[i]<(b/(4*m))){
         printf("No\n");
         return 0;
       }else 
            printf("Yes\n");
            return 0;
    }
    
}