#include <bits/stdc++.h>
using namespace std;

int main()
{
	string S;
	cin >> S;

	int ans = 0;
	int flag = 0;
	for( int i = 0; i < S.size(); i++ ) {
		if( flag ) {
			if( S[i] == 'n' ) {
				ans++;
				flag = 0;
			}
		}
		else {
			if( i + 1 < S.size() && S[i] == 'm' && S[i + 1] == 'i' ) {
				flag = 1;
				i++;
			}
		}
	}

	cout << ans << endl;
}