#include<bits/stdc++.h>
using namespace std;
int ss(int n){
    int a=n,s=0;
    while(a){
        s=s*10+a%10;
        a/=10;
    }
    return s;
}
int main()
{
    int n,i=0,j;
    cin>>n;
    while(ss(n)!=n){
        n+=ss(n);
        i++;
    }
    cout<<i;
    return 0;
}
/**************************************************************
	Problem: 1083
	User: fzy001
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/