Count Hi

Count Hi
Given a string, compute recursively (no loops) the number of times lowercase "hi" appears in the string.

Input
On the first line you will be given the string.

Output
On the only output line you should print the number of hi-s.

Sample tests
Input
xxhixx
Output
1
Input
xhixhix
Output
2

import java.util.Scanner;

public class CountHi {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();
        System.out.println(countHi(input));
    }
    static int countHi (String string){
        if(string.length()<2){
            return 0;
        }
        if(string.substring(0,2).equals("hi")){
            return 1+countHi(string.substring(2));
        }
        return countHi(string.substring(1));
    }
}