#include<stdio.h>
char s[300005];
int main()
{
	int n;
	scanf("%d", &n);
	int i, j;
	scanf("%s", s);
	char t[8] = "HAPPY";
	int ans = 0, f;
	for (i = 0; i < n - 9; i++)
	{
		f = 0;
		for (j = 0; j < 5; j++)
			if (s[i + j] != t[j])
				f++;
		if (f == 0)
		{
			ans++;
			s[i + 4] = '*';
		}
	}
	for (i = n - 5, j = 0; j < 5; j++)
		if (s[i + j] != t[j])
			ans++;
	printf("%d\n", ans);
	return 0;
}