#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,a,b,c,sum=0,t;
    cin>>n;
    for(;;)
    {
        a=n%10;
        b=n/10%10;
        c=n/100%10;
        if(a>b)
        {
            t=a;
            a=b;
            b=t;
        }   
        
        if(a>c)
        {
            t=a;
            a=c;
            c=t;
        }
        if(b>c)
        {
            t=b;
            b=c;
            c=t;
        }
        sum++;
        n=(c*100+a)-(a*100+c);
        if(n==495)
        {
            break;
        }
    }
    cout<<sum;
    return 0;
}

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