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/*                              */

/* Polozov Victor (с) 2009      */

/* Task 1b: iterative factorial */

/*                              */

#include "stdio.h"

int main()

{

 int n;

 int i;

 int fact = 1;

 /* read N */

 scanf("%d", &n);

 /* N! = 2 * 3 * ... N, if N >= 2 */

 /* N! = 1       else   */

 for (i = 2; i <= n; i++)

 {

  fact = i * fact;

 }

 /* print N! */

 printf("%d", fact);

 return 0;

}

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