#include <stdio.h>
int main(int argc, char const *argv[]){
	int n,m,a[1000],i,max=0,tmp,j;
	scanf("%d %d",&n,&m);
	if(n>=2&&m>=2){
		for(i=0;i<n;i++)
			scanf("%d",&a[i]);
		for(i=0;i<n;i++)
			for(j=i+1;j<n;j++){
				tmp=a[i]+a[j];
				if(tmp<=m&&tmp>max)
					max=tmp;
			}
			if(max==0)printf("NONE\n");
			else printf("%d\n",max);
		}
		return 0;
	}
