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

#define REP(i,n) for(int i=0;i<n;i++)
#define rep(i,n) for(int i=0;i<n;i++)
#define INF 1<<29
#define LINF LLONG_MAX/3
#define MP make_pair
#define PB push_back
#define EB emplace_back
#define ALL(v) (v).begin(),(v).end()
#define debug(x) cerr<<#x<<":"<<x<<endl
#define debug2(x,y) cerr<<#x<<","<<#y":"<<x<<","<<y<<endl
template<typename T> ostream& operator<<(ostream& os,const vector<T>& vec){ os << "["; for(const auto& v : vec){ os << v << ","; } os << "]"; return os; }

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;

int main(){
    string s;cin>>s;
    int n=s.size();
    string ss="";
    for(int i=0;i<n;i++){
        if(s[i]=='m' or s[i]=='i' or s[i]=='n') ss.push_back(s[i]);
    }

    ll ans=0;
    for(int i=0;i<ss.size();i++){
        string sub = ss.substr(i,3);
        if(sub=="min") ans++;
    }
    cout << ans << endl;
}