#include <iostream>
using namespace std;

int mcount(string a, string b) {
    int i = 0, cnt = 0;
    if (b == "") { return -1; }
    while ((i = a.find(b, i)) > -1) { ++cnt; i += b.size(); }
    return cnt;
}

int main() {
    string s;
    cin >> s;
    cout << mcount(s, "m") << endl;
    return 0;
}