#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){return 0;}
    
  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");
}

  
