#include<stdio.h>

int main(void){
    int i,j,k;
    int N,M;

    scanf("%d %d",&N,&M);

    int a[100];
    int sum=0;
    

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

    int x=sum/(4*M);
    int num;

    for(j=0;j<N;j++){
        if(a[j]>=num){
            num++;
        }
    }
    if(num>M){
        printf("Yes");
    }else{
        printf("No");
    }


    return 0;
}