var a, b; while ((a = read_line()) && (b = read_line())) { var arr = b.split(' '); arr.sort(function (v1, v2) { return v1 - v2; }); for (var i = 0; i < a; i++) { arr[i] = + arr[i]; } if (a % 2 === 0) { console.log((arr[a / 2 - 1] + arr[a / 2]) / 2); } else { ...