#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <fstream>
#include <set>
#include <utility>
#include <algorithm>

using namespace std;

int max(int x, int y) {
	int a;
	(x > y) ? a = x : a = y;
	return a;
}

int min(int x, int y) {
	int a;
	(x < y) ? a = x : a = y;
	return a;
}

int main() {
	
	string s;
	cin >> s;
	int count = 0;
	for (int i = 0; i < s.length(); i++) {
		if (s[i] == 'm')count++;
	}
	cout << count << endl;

	return 0;
}