#include <bits/stdc++.h>
using namespace std;
const int N = 1e6;
const int inf = 1e9 + 7;
int n, a[N];
int main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> n;
for (int i = 1; i <= n; i++) cin >> a[i];
a[n + 1] = inf;
int res = 0;
for (int time = 1; time <= n; time++) {
int minValue = inf;
int i = 1;
for (int j = 1; j <= n + 1; j++) {
minValue = min(minValue, a[j]);
if (a[j] == inf) {
if (i + 1 < j) res++;
while (i < j) {
if (a[i] == minValue) a[i] = inf;
i++;
}
minValue = inf;
}
}
bool stop = true;
for (int i = 1; i <= n; i++) {
// cout << a[i] << ' ';
if (a[i] != inf) stop = false;
}
// cout << '\n';
if (stop == true) break;
}
cout << res;
return 0;
}
