#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001



int main(){
	
	int n;
	cin>>n;
	vector<int> a(n);
	rep(i,n)cin>>a[i];
	int t = 1;
	rep(i,n){
		for(int j=i+1;j<n;j++){
			if(a[i]>a[j])t*=-1;
		}
	}
	cout<<t<<endl;
	
	
	return 0;
}