#include <iostream>
#include <cmath>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
typedef long long lint;

#define MIN(a,b) ((a)<(b)?(a):(b))
#define MAX(a,b) ((a)>(b)?(a):(b))



int main()
{
	int min = 0;
	string S;
	cin >> S;

	for (int i = 0; i < S.size(); i++)
		if (S[i] == 'm') min++;

	cout << min << endl;

	return 0;
}