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

int main(int argc, char *argv[])
{
  int a,k=-1,fact=1,term=1,i=0;
  char c;
  scanf("%d",&a);
  getchar();
  do{
     c=getchar();
     k++;
     }
  while(c==33);
  if(k>a) fact=-1;
  while(fact>0){
                term*=fact;
                fact=(a-i*k);
                i++;
                }



  if(k<=a) printf("%d",term);
  system("PAUSE");
  return 0;
}


Edited by author 01.07.2012 19:03

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

int main(int argc, char *argv[])
{
  int a,k=-1,fact=1,term=1,i=0;
  char c;
  scanf("%d",&a);
  getchar();
  do{
     c=getchar();
     k++;
     }
  while(c==33);
  if(k>a) fact=-1;
  while(fact>0){
                term*=fact;
                fact=(a-i*k);
                i++;
                }



  if(k<=a) printf("%d",term);
  system("PAUSE");
  return 0;
}