#include <stdio.h>

int main(void) {
  int n;
  int m;
  int a[1000];
  int count = 0;
  int sum = 0;
  scanf("%d, %d", &n, &m);
  for(int i = 0;i < n; i++) {
    scanf("%d", &a[i]);
    sum += a[i];
  }
  for(int i = 0;i < n; i++) {
    if(a[i] >= sum / (4 * m)) {
      count++;
    }
  }
  if(m <= count) {
    printf("Yes");
  } else {
    printf("No");
  }
  return 0;
}
