import java.util.*;
 
public class Main {
	public static void main(String[] args) {
 
	Scanner sc  = new Scanner(System.in);
        
    String s1 = sc.next();
    char[] c1 = s1.toCharArray();
    int f=0;
    int ans=0;
    
    for( int i=0; i<s1.length(); i++ ){
        
        if(c1[i]=='m'&&f==0)
        {
            f++;
        }else if(c1[i]=='i'&&f==1){
            f++;
        }else if(c1[i]=='n'&&f==2){
            f=0;
            ans++;
        }
        
    }

        System.out.print(ans);
        System.out.println();
	}
        
}