const input = require('fs').readFileSync('/dev/stdin', 'utf8');const lines = input.trim().split('\n');let array;let index = 0;let n;let m;let answers = [];while (line = lines.shift()) {if(index === 0){const test = line.split(' ').map(Number);n = test[0];m = test[1];index ++;} else {    array = line.split(' ').map(Number);let answer = 0;for(let i = 0; i<n ;i++){        for(let j = 0;j<n;j++){if(i === j){continue;}const test = array [i] + array [j];if(test > answer && test <= m){answer = test;}}}index = 0;answers.push(answer);}}answers.forEach(data => console.log(data ? data : 'NONE'))
