#include "bits/stdc++.h"
using namespace std;

int main(){
int a,b,c;
string s;
cin >>s;
for(int i=0;i<s.size();i++){
    if(s.at(i)=='m')a++;
    if(s.at(i)=='i')b++;
    if(s.at(i)=='n')c++;
}
cout <<min({a,b,c})<<endl;
}