#include<bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define int long long
//#define int double
typedef pair<int,int> pii;
typedef vector<pii> vii;
typedef vector<int> vi;
typedef vector<bool> vb;
#define FOR(i,a) for(int i=0;i<(a);i++)
#define FORE(i,a,b) for(int i=(a);i<(b);i++)
#define all(x) x.begin(),x.end()
#define fi first
#define se second
#define pb push_back
#define sp <<" "<<
#define cont(x) for(auto el:x) cout<<el<<' ';cout<<endl;
#define contp(x) for(auto el:x) cout<<el.fi<<'-'<<el.se<<' ';cout<<endl;
#define DEBUG(x) cout<<#x sp x<<endl;
#define carp(x,y) ((x%MOD)*(y%MOD))%MOD
#define topla(x,y) ((x%MOD)+(y%MOD))%MOD
#define mid (double)(l+r)/2
const int MAXN=1e5+5;
const int MOD=1e9+7;
const int INF=1e18;
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
string s;
cin>>s;
int n=s.length();
int cur=0;
string honi="HONI";
int say=0;
FOR(i,n){
if(s[i]==honi[cur]){
cur++;
if(cur==4){
say++;
cur=0;
}
}
}
cout<<say<<endl;
}
