import java.io.PrintWriter
import java.util.*
import kotlin.math.*

fun PrintWriter.solve() {
    val n = nextInt()
    val a = Array(n) { nextInt() }
    if (isSorted(a)) {
        println(0)
        return
    }
    for (i in 1..n) {
        for (j in 1 until i) {
            val b = a.copyOf()
            for (k in 0 until i) {
                b[k] = a[(j + k) % i]
            }
            if (isSorted(b)) {
                println(1)
                return
            }
        }
    }
    println(2)
}

fun isSorted(a: Array<Int>): Boolean {
    return (0 until a.count() - 1).all { a[it] <= a[it + 1] }
}

fun main() {
    val writer = PrintWriter(System.out, false)
    writer.solve()
    writer.flush()
}

// 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