#include<bits/stdc++.h>
using namespace std;
int n,a[300010],ans,tag;
int main(){
	scanf("%d",&n);
	for(int i = 1;i<=n;i++)
		scanf("%d",&a[i]);
	if(a[1]<=a[2]) tag = 1;
	else tag = 0,ans++; 
	for(int i = 3;i<=n;i++){
		if(tag&&a[i]<a[i-1]){
			ans++;
			tag = 0;
		}else if(~tag&&a[i]>a[i-1]){
			tag = 1;
		}
	}
	if(tag==1&&ans!=0) ans++;
	if(ans==0) printf("0");
	else printf("%d",(int)log2(ans)+1);
	return 0;
}