daan

#include <iostream>
using                                   namespace                                                            std;

int             main() {
	int                    total           =                      1,                               x          ,     y;
	cin                                  >>                                 x                    >>              y;
	for (               int                      i                    =               x;     i         <=         y;
	                    ++ i) {
		total                         *=                           i;
	}
	cout                        <<                          total;
}