#include using namespace std; const int N = 10; int a[N]; int main() { int n; cin >> n; int cnt = 0; while (true) { cnt++; a[0] = n / 100; a[1] = n % 100 / 10; a[2] = n % 10; sort(a, a + 3); int mx = a[2] * 100 + a[1] * 10 + a[0]; int mi = a[0] * 100 + a[1] * 10 + a[2]; n = mx - mi; if (n == 495) break; } cout << cnt << endl; return 0; }