#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = (a); i < (b); ++i)
#define REP(i,n) FOR(i,0,n)
#define SZ(n) (int)(n).size()
#define ALL(n) (n).begin(), (n).end()
using namespace std;
typedef long long LL;
typedef vector<int> VI;

int main() {
	string s;
	cin >> s;
	int ans = 0;
	REP(i, SZ(s)) {
		if (s[i] == 'm' && s[i + 1] == 'i') {
			for (int j = i + 2; s[j]; ++j) {
				if (s[j] == 'n') {
					ans++;
					i = j;
					break;
				}
			}
		}
	}
	cout << ans << endl;
	return 0;
}