#include<stdio.h>

int main(void){
    int s,N,M,A[100];
    int i,j,index,max;

    scanf("%d%d",&N,&M);
    for(i=0; i<N; i++)
        scanf("%d",&A[i]);
    
    for(i=0; i<N-1; i++){
        index = i; max = A[i];
        for(j=i+1; j<N; j++){
            if(A[j]>max){
                max = A[j]; index = j;
            }
        }
        A[index] = A[i];    A[i] = max;
    }
    
    s = 0;
    for(i=0; i<N; i++){
        s = s + A[i];
    }

    if(A[M-1] > s/(4*M))
        printf("Yes\n");
    else
        printf("No\n");
    
    return 0;
    
}