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

int main() {
    string S;
    cin >> S;
    int ans = 0, tmp = 0;
    REP(i,S.length()){
        if(S[i]=='m' && S[i+1]=='i' && tmp==0){
            ans++;
            tmp++;
        }
        if(S[i]=='n' && tmp==1){
            ans++;
            tmp--;
        }
    }
    cout << ans/2 << endl;
}