package main

import (
	"fmt"
)

func main() {
	var N int
	var arr [100000]int

	fmt.Scan(&N)
	for i := 0; i < N; i++ {
		fmt.Scan(&arr[i])
	}

	ret := 0
	for i := 0; i < N; i++ {
		if i > 0 && arr[i-1] > arr[i] {
			ret++
		}
	}

	fmt.Println(ret)
}