#include<algorithm>
using namespace std;
int main(){
    int a,b,s,g,z[3]={0},l=0,l1=0,c=0;
    scanf("%d",&a);
    
while(a!=495){
        z[0]=a/100;
        z[1]=a%100/10;
        z[2]=a%10;		
		sort(z,z+3);
        l=z[0]*100+z[1]*10+z[2];
        l1=z[2]*100+z[1]*10+z[0];
        a=l1-l;
        c++;
    }
    printf("%d",c);
    return 0;
}

114514

haoren

.cpp