๐จ ์ฐธ๊ณ ์ฝ๋
์ฝ๋
const fs = require('fs');
const input = +fs.readFileSync('/dev/stdin').toString().trim().split(' ');
const decrease = [];
const getDec = (now, last) => {
for (let i = last - 1; i >= 0; i--) {
decrease.push(now * 10 + i);
getDec(now * 10 + i, i);
}
};
for (let i = 0; i <= 9; i++) {
decrease.push(i);
getDec(i, i);
}
decrease.sort((a, b) => a - b);
if (input >= decrease.length) console.log(-1);
else console.log(decrease[input]);