#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using ll = long long;
using vi = vector<int>;
using vvi = vector<vector<int>>;
using pii = pair<int, int>;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define repr(i, n) for (int i = (int)(n - 1); i >= 0; --i)

int main() {
    int n;
    cin >> n;
    vi a(n);
    rep(i, n) cin >> a[i];
    ll ret = 0;
    int t = (a[0] < a[1] ? 0 : 1);
    for (int k = 2; k < n; k++) {
        if (a[k - 1] > a[k]) {
            ret += k - t - 1;
            t++;
        }
    }
    cout << ret << endl;
    return 0;
}