#include<bits/stdc++.h>
using namespace std;
int main()
{
    int res;
    cin>>res;
    int a=res/100;
    int b=res/10%10;
    int c=res%10;
    int cnt=0;
    if(res==495)
    {
        cout<<'0';
        return 0;
    }
    do
    {
        a=res/100;
        b=res/10%10;
        c=res%10;
        int x1,x2,x3,x4,x5,x6;
        x1=a*100+b*10+c*1;
        x2=a*100+c*10+b*1;
        x3=b*100+a*10+c*1;
        x4=b*100+c*10+a*1;
        x5=c*100+a*10+b*1;
        x6=c*100+b*10+a*1;
        int maxv;
        maxv=max({x1,x2,x3,x4,x5,x6});
        int minv;
        minv=min({x1,x2,x3,x4,x5,x6});
        res=maxv-minv;
        if(res==495)
        {
            cnt++;
            break;
        }
        else
        {
            cnt++;
            continue;
        }
    }while(1);
    cout<<cnt;
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin>>n;
	int cnt=0;
	while(n!=495)
	{
		
		int g=n%10,s=n/10%10,b=n/100%10;
		if(g<s) swap(g,s);
		if(g<b) swap(g,b);
		if(s<b) swap(s,b);
		cnt++;
		int a1=g*100+s*10+b,a2=b*100+s*10+g;
		n=a1-a2;
	}
	cout<<cnt;
	return 0;
}