gatauah

#include<stdio.h>

int main(){
	int people;
	scanf("%d", &people);fflush(stdin);
	int table;
	scanf("%d", &table);fflush(stdin);
	int a[100];
	int temp=0;
	a[-1]=0;
	for(int i=0;i<100;i++){
		a[i]=0;
	}

	for(int i=0;i<table;i++){
		scanf("%d", &a[i]);fflush(stdin);
	}

	for(int i=0;i<table;i++){

		if(a[i]>=people){
			temp = temp+1;

		}else if(a[i]+a[i-1]>=people){
			temp = temp+1;

		}else if(a[i] + a[i+1]>=people){
			temp = temp+1;

		}else if(a[i]+a[i-1]+a[i+1]>=people){
			temp = temp+1;

		}

	}

	if(temp!=0){
		printf("YES");
	}else{
		printf("NO");
	}


temp=0;
	getchar();
}