package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	in := bufio.NewReaderSize(os.Stdin, 1<<20)

	var n int
	var s string
	fmt.Fscan(in, &n, &s)

	left := 0
	for left < n && s[left] == '<' {
		left++
	}

	right := 0
	for right < n && s[n-1-right] == '>' {
		right++
	}

	fmt.Println(left + right)
}