gistfile1.java

import java.util.*;

class HPYNOS {
    public static void main(String[]args){
        Scanner s = new Scanner(System.in);
        int[] cache = new int[800];
        int N = s.nextInt();
        int count = 0;
        do {
            N = breakIt(N);
            if(cache[N] > 0) {
                count = -1;
                break;
            }
            cache[N] = 1;
            count++;
        } while(N != 1);
        System.out.println(count);
    }

    private static int breakIt(int n) {
        int s;
        for(s = 0; n > 0; n /= 10) s += (n % 10) * (n % 10);
        return s;
    }
}