import java.io.PrintWriter import java.util.* import kotlin.math.* fun PrintWriter.solve() { val n = nextInt() val a = Array(n) { nextInt() } val m = minOf(n, 16) val b = a.take(m) val set = mutableSetOf(0) fun shift(x: Int) = x / 2 + 32768 * (x % 2) for (entry in b) { var v = entry val setAdd = mutableSetOf() for (i in 0 until 15) { v = shift(v) for (w in set) { setAdd.add(v or w) } } for (add in setAdd) { set.add(add) } } println(set.maxOrNull()) } fun main() { Thread(null, { val writer = PrintWriter(System.out, false) writer.solve() writer.flush() }, "solve", abs(1L.shl(26))) .apply { setUncaughtExceptionHandler { _, e -> e.printStackTrace(); kotlin.system.exitProcess(1) } } .apply { start() }.join() } // region Scanner private var st = StringTokenizer("") private val br = System.`in`.bufferedReader() fun next(): String { while (!st.hasMoreTokens()) st = StringTokenizer(br.readLine()) return st.nextToken() } fun nextInt() = next().toInt() fun nextLong() = next().toLong() fun nextLine() = br.readLine() fun nextDouble() = next().toDouble() // endregion