#include<stdio.h>

int main(){
  int n,m,a[1000],i,f,vote,total;

  scanf("%d %d",&n,&m);
  if(1<=m&&m<=n&&n<=100){
    for(i=0;i<=n-1;i++){
      scanf("%d",&a[i]);
      if(a[i]<1||a[i]>1000){break;}
    }
    for(i=0;i<=n-2;i++){
      total=a[i]+a[i+1];}

    vote=total/4/m;

    for (i=0;i<=n-1;i++){
      if(a[i]>=vote+1){
	f++;
      }
    }
  }
  if(f>=m){
    printf("Yes");
  }else printf("No");
}

  
