Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func main() {
	io := NewIo()
	defer io.Flush()
	for {
		n, m := io.NextInt(), io.NextInt()
		if n == 0 {
			break
		}
		a := make([]int, n)
		for i := 0; i < n; i++ {
			a[i] = io.NextInt()
		}
		ans := 0
		for i := 0; i < n; i++ {
			for j := i + 1; j < n; j++ {
				if a[i]+a[j] <= m {
					ans = intMax(a[i]+a[j], ans)
				}
			}
		}
		if ans == 0 {
			io.Println("NONE")
		} else {
			io.Println(ans)
		}
	}
}

func intMax(a, b int) int {
	if a < b {
		return b
	}
	return a
}

// I/O template
type Io struct {
	reader    *bufio.Reader
	writer    *bufio.Writer
	tokens    []string
	nextToken int
}

func NewIo() *Io {
	return &Io{
		reader: bufio.NewReader(os.Stdin),
		writer: bufio.NewWriter(os.Stdout),
	}
}

func (io *Io) Flush() {
	err := io.writer.Flush()
	if err != nil {
		panic(err)
	}
}

func (io *Io) NextLine() string {
	var buff []byte
	for {
		line, isPrefix, err := io.reader.ReadLine()
		if err != nil {
			panic(err)
		}
		buff = append(buff, line...)
		if !isPrefix {
			break
		}
	}
	return string(buff)
}

func (io *Io) Next() string {
	for io.nextToken >= len(io.tokens) {
		line := io.NextLine()
		io.tokens = strings.Fields(line)
		io.nextToken = 0
	}
	s := io.tokens[io.nextToken]
	io.nextToken++
	return s
}

func (io *Io) NextInt() int {
	i, err := strconv.Atoi(io.Next())
	if err != nil {
		panic(err)
	}
	return i
}

func (io *Io) NextFloat() float64 {
	i, err := strconv.ParseFloat(io.Next(), 64)
	if err != nil {
		panic(err)
	}
	return i
}

func (io *Io) Println(a ...interface{}) {
	fmt.Fprintln(io.writer, a...)
}

func (io *Io) Printf(format string, a ...interface{}) {
	fmt.Fprintf(io.writer, format, a...)
}

func (io *Io) PrintIntSlice(a []int) {
	b := []interface{}{}
	for _, x := range a {
		b = append(b, x)
	}
	io.Println(b...)
}

func (io *Io) PrintStringSlice(a []string) {
	b := []interface{}{}
	for _, x := range a {
		b = append(b, x)
	}
	io.Println(b...)
}

func Log(name string, value interface{}) {
	fmt.Fprintf(os.Stderr, "%s=%+v\n", name, value)
}

func ExampleIo() {
	io := NewIo()
	defer io.Flush()
	a := make([]int, 0, 3)
	a[0], a[1], a[2] = io.NextInt(), io.NextInt(), io.NextInt()
	io.Println(a)
	io.PrintIntSlice(a)
	Log("io", a)
}

C++: #include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; i++)
#define loop(i, s, n) for (int i = s; i < n; i++)
#define erep(e, v) for (auto &&e : v)
#define all(in) in.begin(), in.end()
#define MP make_pair
#define INF (sizeof(int) == 4 ? (int) 1e9 : (int) 1e18)
#define EPS 0.0000000001
using namespace std;
template <class T, class S> void cmin(T &a, const S &b) {
    if (a > b) a = b;
}
template <class T, class S> void cmax(T &a, const S &b) {
    if (a < b) a = b;
}
template <typename Head, typename Value>
auto vectors(const Head &head, const Value &v) {
    return vector<Value>(head, v);
}
template <typename Head, typename... Tail> auto vectors(Head x, Tail... tail) {
    auto inner = vectors(tail...);
    return vector<decltype(inner)>(x, inner);
}
template <class T, class S> void join(T &a, S terminator) {
    for (auto itr = begin(a); itr != end(a); itr++) {
        if (itr != begin(a)) cout << terminator;
        cout << *itr;
    }
    cout << endl;
}
int W, H;
int dx[] = {0, 0, 1, -1}, dy[] = {1, -1, 0, 0};
bool valid(int x, int y) { return (0 <= x && x < W) && (0 <= y && y < H); }
auto out(int a, int b) {
    (a > b ? a += 1 : b += 1);
    cout << a << " " << b << endl;
}
main() {
    int n, m;
    while (cin >> n >> m, n + m) {
        vector<int> v(n);
        erep(e, v) cin >> e;
        sort(all(v));
        int maxi = -10;
        rep(i, n) {
            rep(j, n) {
                if (i == j or v[i] + v[j] > m) continue;
                maxi = max(v[i] + v[j], maxi);
            }
        }
        cout << (maxi > 0 ? to_string(maxi) : "NONE") << endl;
    }
}

C++: #include <bits/stdc++.h>
#define GET_MACRO(_1,_2,_3,_4,_5,_6,_7,_8,NAME,...) NAME
#define pr(...) cerr<< GET_MACRO(__VA_ARGS__,pr8,pr7,pr6,pr5,pr4,pr3,pr2,pr1)(__VA_ARGS__) <<endl
#define pr1(a) (#a)<<"="<<(a)<<" "
#define pr2(a,b) pr1(a)<<pr1(b)
#define pr3(a,b,c) pr1(a)<<pr2(b,c)
#define pr4(a,b,c,d) pr1(a)<<pr3(b,c,d)
#define pr5(a,b,c,d,e) pr1(a)<<pr4(b,c,d,e)
#define pr6(a,b,c,d,e,f) pr1(a)<<pr5(b,c,d,e,f)
#define pr7(a,b,c,d,e,f,g) pr1(a)<<pr6(b,c,d,e,f,g)
#define pr8(a,b,c,d,e,f,g,h) pr1(a)<<pr7(b,c,d,e,f,g,h)
#define prArr(a) {cerr<<(#a)<<"={";int i=0;for(auto t:(a))cerr<<(i++?", ":"")<<t;cerr<<"}"<<endl;}
using namespace std;
using Int = long long;
using _int = int;
using ll = long long;
using Double = long double;
const Int INF = (1LL<<60)+1e9; // ~ 1.15 * 1e18
const Int mod = (1e9)+7;
const Double EPS = 1e-8;
const Double PI = 6.0 * asin((Double)0.5);
using P = pair<Int,Int>;
template<class T> T Max(T &a,T b){return a=max(a,b);}
template<class T> T Min(T &a,T b){return a=min(a,b);}
template<class T1, class T2> ostream& operator<<(ostream& o,pair<T1,T2> p){return o<<"("<<p.first<<","<<p.second<<")";}
template<class T1, class T2, class T3> ostream& operator<<(ostream& o,tuple<T1,T2,T3> t){
  return o<<"("<<get<0>(t)<<","<<get<1>(t)<<","<<get<2>(t)<<")";}
template<class T1, class T2> istream& operator>>(istream& i,pair<T1,T2> &p){return i>>p.first>>p.second;}
template<class T> ostream& operator<<(ostream& o,vector<T> a){Int i=0;for(T t:a)o<<(i++?" ":"")<<t;return o;}
template<class T> istream& operator>>(istream& i,vector<T> &a){for(T &t:a)i>>t;return i;}



signed main(){
  srand((unsigned)time(NULL));
  cin.tie(0);
  ios_base::sync_with_stdio(0);
  cout << fixed << setprecision(12);

  while(1){
    int n, m;
  
    cin>>n>>m;
    if(n == 0 && m == 0) break;
    vector<int> A(n);
    cin>>A;
  
    int ans = -1;
    for(int i=0;i<n;i++)
      for(int j=i+1;j<n;j++){
	if(A[i] + A[j] <= m) ans = max(ans, A[i] + A[j]);
      }

    if(ans == -1) cout<<"NONE"<<endl;
    else cout<<ans<<endl;
  }
  
  return 0;
}

C++: #include<iostream>
using namespace std;

int main(){
	int pay,n,m;
	while(true){
		n=0;
		m=0;
		pay=0;	
		cin>>n>>m;
		if(n==0&&m==0){
			break;
		}
		int a[n];
		for(int i=0;i<n;i++){
			cin>>a[i];
		}
		for(int i=0;i<n;i++){
				for(int j=i+1;j<n;j++){
					if(a[i]+a[j]<=m&&a[i]+a[j]>=pay){
						pay=a[i]+a[j];
					}
				}
		}
		if(pay!=0)
		cout<<pay<<endl;
		else
		cout<<"NONE"<<endl;
	}
	return 0;
	
}

C++: #include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <cstring>
#include <climits>

#define LP(i,n) for(int i=0;i<n;i++)
#define Mset(x,v) memset(x,v,sizeof(x))
#define INF INT_MAX

using namespace std;
using LL=long long;

int M[1005];

int main(){
    int n,m,maxn;
    while(1){
        cin>>n>>m;
        if(n==0) break;
        maxn=0;
        LP(i,n) cin>>M[i];
        for(int i=0;i<n-1;i++){
            for(int j=i;j<n;j++){
                if(M[i]+M[j]<=m) maxn=max(maxn,M[i]+M[j]);
            }
        }
        if(maxn==0) cout<<"NONE"<<endl;
        else cout<<maxn<<endl;
    }
    return 0;
}

C++: #include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

int main() {
  int n, m;
  vector<int> a;
  while (1) {
    cin >> n >> m;
    if(n == 0 && m == 0)
      break;

    for (int i = 0; i < n; i++) {
      int A;
      cin >> A;
      a.push_back(A);
    }

    vector<int> sum;

    for(int i = 0; i < n; i++) {
      for(int j = 0; j < n; j++) {
        int Sum = a[i] + a[j];
        sum.push_back(Sum);
      }
    }

    sort(sum.begin(), sum.end());

    for(int i = 0; i < sum.size(); i++){
      if(sum[i] < m) {
          cout << sum[i] << endl;
          break;
      }
    }

    sum.clear();
    a.clear();
  }
  return 0;
}