#include <stdio.h>

int main(){
  int N, M = 0;
  scanf("%d%d", &N, &M);
  int i, sumV, now = 0;
  int voteValue[N];
  for (i = 0; i < N; i++) {
    voteValue[i] = 0;
    scanf("%d", &voteValue[i]);
    sumV += voteValue[i];
  }
  int ch = 4 * M;
  for (i = 0; i < N; i++) {
   if (voteValue[i] * ch >= sumV ){
    now++; 
   }
  }
  if (now >= M){
    printf("Yes");
  }else{
    printf("No");
  }
  
}