#include <algorithm>
#include <climits>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <iostream>
#include <map>
#include <ostream>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>
#define INF 1000000000
#define rep(i,a,b) for (int i=(a);i<(b);i++)
#define rev(i,a,b) for (int i=(a)-1;i>=b;i--)
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef queue<int> qi;
typedef vector<int> vi;
typedef vector<string> vs;
int dx[4] = { 0, 1, 0, -1 };
int dy[4] = { 1, 0, -1, 0 };

int n;
int a[100000];

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	cin >> n;
	rep(i,0,n) cin >> a[i];

	int ans = 0;
	rev(i,n,1) {
		if(a[i] < a[i-1]) {
			int tmp = a[i];
			rev(k, i+1, 1) a[k] = a[k-1];
			a[0] = tmp;
			ans++;
		}
	}

	cout << ans << endl;

	return 0;
}