54. 1193 (분수찾기)

let input = require(`fs`).readFileSync(`/dev/stdin`).toString().split();

X = parseInt(input[0]);
let cnt = 1;

while (true) {
  X -= cnt;
  if (X <= 0) {
    break;
  }
  cnt++;
}

let i = X + cnt;

const A = cnt + X;
const B = cnt + 1 - A;

if (cnt % 2 === 0) {
  console.log(A + "/" + B);
} else {
  console.log(B + "/" + A);
}