#include <stdio.h>
 
int main(void){
  int N,M,i,l,sum;
  int A[N];
  scanf("%d%d",&N,&M);
  for(i=0;i<N;i++){
    scanf("%d",&A[i]);
    sum+=A[i];
  }
  for(l=0;l<N;l++){
    if(A[l]>sum*(1/4*M)){
      puts("Yes");
      break;
    }
    else{
      puts("No");
      break;
    }
  }
  return 0;
    }