#include <iostream>
#include <string>

int main() {
	std::string s;
	std::cin >> s;

	int i = 0, f = 0, cnt = 0;
	while (i != s.size()) {
		if (s[i] == '-') {
			i++;
			continue;
		}
		if (s[i] == 'm' && s[i + 1] == 'i') {
			f = 1;
		}
		if (s[i] == 'n' && f) {
			cnt++;
			f = 0;
		}
		i++;
	}

	std::cout << cnt << std::endl;

	return 0;
}