#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); ++i)

int main(void)
{
  string s;
  cin >> s;

  int ans = 0;
  rep(i, s.size() - 2)
  {
    if (s[i] == 'm' && s[i + 1] == 'i')
    {
      int cur = i + 2;
      while (true)
      {
        if (s[cur] == 'n')
        {
          ans++;
          break;
        }
        else cur++;
      }
    }
  }

  cout << ans << endl;
  return 0;
}