#include<stdio.h>
#define rep(a,b) for(int i = a;i <= b;i++)

int main(void){
  int N,M; scanf("%d%d",&N,&M);
  int A[110]; rep(1,N){scanf("%d",&A[i]);}
  long int SUM = 0; rep(1,N){SUM += A[i];}

  int cnt = 0; rep(1,N){if(A[i]*4*M >= SUM){cnt += 1;}}

  if(cnt >= M){printf("Yes");}
  else{printf("No");}

  return 0;
}
