#include<stdio.h>
int main(){
  int N, M;
  scanf("%d %d",&N, &M);
  int A[N];
  int i, sum = 0;
  for(i=0; i < N; i++){
    scanf("%d",&A[i]);
    sum += A[i];
  }

  if(A[M - 1] >= sum / 4 * M) printf("Yes\n");

  else printf("No\n");

}
