#include<stdio.h>

int main(void){

    int M,N,i,A[101],hyou_sum = 0,boder,ans = 0;

    scanf("%d %d",&N,&M);
    for(i = 0;i < N;i++){
        scanf("%d",&A[i]);
        hyou_sum += A[i];
    }

    for(i = 0;i < N;i++){
        if(A[i]*4*M >= hyou_sum) ans++;
    }

    (ans >= M) ? printf("Yes\n") : printf("No\n");
    return 0;
}
