#include<stdio.h>                                                 
                                                                  
int main(void){                                                   
   int N,M;                                                       
   scanf("%d %d",&N,&M);                                          
   int data[N],i,sum,count;                                       
                                                                  
   sum = 0;                                                       
   for(i = 0; i < N; i++){                                        
      scanf("%d",&data[i]);                                       
      sum += data[i];                                             
   }                                                              
                                                                  
   count = 0;                                                     
   for(i = 0; i < N; i++){                                        
      if( data[i]*4*M >= sum){                                    
         count++;                                                 
      }                                                           
   }                                                              
   if( count < M){                                                
      printf("No");                                               
   } else {                                                       
      printf("Yes");                                              
   }                                                              
} 