#include <iostream>
#include <algorithm>
#include <vector>
#include<string>

using namespace std;
int main(){
	string s;
	cin >> s;
	bool flag;
	int count = 0;
	for (int i = 0; i < (s.size()); i++) {
		if (s[i] == 'm' && s[i + 1] == 'i') {
			flag = true;
		}
		if (flag) {
			if (s[i] == 'n') {
				count++;
				flag = false;
			}
		}
	}
	cout << count << endl;
}