#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <bitset>
using namespace std;
#define FOR(I,A,B) for(int I = (A); I < (B); ++I)
typedef long long ll;

int main(){
  string s;
  cin >> s;
  string min;
  FOR(i,0,s.length()){
    if(s[i]!='-') min.push_back(s[i]);
  }
  int ans = 0;
  for(int i = 0; i + 2 < min.length(); i++){
    string ss = min.substr(i,3);
    if(ss == "min") ans++;
  }
  cout << ans << endl;
  return 0;
}