#include <iostream>
#include <string>
using namespace std;
int main(void) {
	char c;
	string s;
	while (cin >> c) {
		if (c != '-') 
			s += c;
	}
	int cnt = 0;
	if (s.size() >= 3) {
		for (int i = 0; i < s.size() - 2; ++i) {
			if (s.substr(i, 3) == "min")
				++cnt;
		}
	}
	cout << cnt << endl;
	return 0;
}