What could be the problem?  My assumption is when N <= k the answer
is N*N. The rest is normal calculation.  But I always got WRONG
ANSWER !!! Please help !!!

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#include <stdio.h>
#include <stdlib.h>

void main ()
{
 int number, number_of_factoral;
 int total, i, frequency;
 char factor[21];
 div_t result;
 int option;

 scanf("%d %s",&number, factor);

 number_of_factoral = strlen(factor);

 if (number <= number_of_factoral)
 {
        total = number * number;
 }
 else
 {
        result = div(number, number_of_factoral);
        total = number;
        i = 1;

        while ((number - (i * number_of_factoral)) > 0)
        {
                total = total * (number- (i * number_of_factoral));
                i = i + 1;
        }

        if (result.rem > 0)
            total = total * result.rem;
        else
            total = total * number_of_factoral;

 }
 printf("%d\n", total);
}
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