#include<iostream>
#include<string>
using namespace std;

int main() {
	int ans = 0, i = 0;
	string s;
	cin >> s;

	while (s[i] != '\0') {
		if (s[i] == 'm' ){
			ans++;
		}
		i++;
	}

	cout << ans << endl;

	return 0;
}