public class Main {
public static void main(String[] args) {
int l=2019;
int d = 324;
int exchange = 0;
int s=0;
for (int i = 0;; i++) {
exchange =l-d;
if (exchange == 0) {
System.out.println(s);
break;
}
l = exchange>d?exchange:d;
d = exchange>d?d:exchange;
s++;
}
}
}