#include<bits/stdc++.h>
using namespace std;
const int N = 2e5 + 5;
int ne[N];
int main (){
	ios::sync_with_stdio(0);
	cin.tie(0);cout.tie(0);


	string a;
	cin >> a;
	a = "|edgnb" + a;
	int n = a.size() - 1;
	//cerr << n << endl;
	for(int i = 2 , j = 0 ; i <= n ; ++i) {
		while(j && a[i] != a[j + 1]) j = ne[j];
		if(a[i] == a[j + 1]) ++j;
		ne[i] = j;
	}
	//cerr << a << endl;
	int ans = 0;
	for(int i = 4 ; i <= n ; ++i) {
		if(ne[i] != 0 && ne[i] % 5 == 0) {
			
			++ans;
		}
	}	
	cout << ans << '\n';
	return 0;
}
//eedgnb