nineteen.cpp

#include <bits/stdc++.h>
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define endl '\n'
#define int long long int
using namespace std;
#define pii pair <int, int>
#define mii map<int, int>
#define pb push_back
#define deb(x) cout << #x << " " << x << endl
#define deb2(x, y) cout << #x << " " << x << " " << #y << " " << y << endl
#define Loop(s, e, itr) for (int itr = s; itr < e; itr++)
#define loop(n) for(int i = 0; i < n; i++)
#define vin vector<int>
#define vec vector
#define w(t) int tc; cin >> tc; for(int t = 1; t <= tc; t++)
#define mk_arr(n, t, s) t* n = new t[s]; loop(s) cin >> n[i]; 
#define mi_arr(n, s) int* n = new int[s]; loop(s) cin >> n[i]; 
#define arr_out(n, s) Loop(0, s, lout) cout << n[lout] << " ";
#define pi(x) printf("%lld ", x);
#define mod 1000000007


int32_t main(){
    string str;
    cin >> str;
    int n, i, t, e;
    n = i = t = e = 0;
    int len = str.length();
    for(auto j: str){
        switch (j)
        {
            case 'n':
                n++;
                break;
            case 'i':
                i++;
                break;
            case 't':
                t++;
                break;
            case 'e':
                e++;
                break;
        }
    }
    if(!(n%2)) n--;
    n /= 2;
    e /= 3; 
    cout << min(i, min(n, min(t, e))) << endl;
}