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

signed main() {
  string S;
  cin >> S;

  //0のときはmを探す状態、1のときはiを探す状態、2のときはnを探す状態
  int fg = 0;
  int ans = 0;
  for( int i = 0; i < S.size(); i++) {
    if( fg == 0  && S.at(i) == 'm' ) fg = 1;
    else if( fg == 1 && S.at(i) == 'i') fg = 2;
    else if( fg == 2 && S.at(i) == 'n'){
      fg = 0;
      ans++;
    }
  }
  cout << ans << endl;

}