fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let mut a = String::new();
    std::io::stdin().read_line(&mut a).ok();
    let a: Vec<isize> = a.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();

    let mut result = 0usize;
    let mut cnt = 0usize;
    for i in 0..n-1 {
        if a[i] < a[i+1] {
            cnt += 1;
        } else {
            result += cnt;
        }
    }
    println!("{}", result);
}