10323 aa.cpp

#include<stdio.h>
int main()
{
	int n;
	while(scanf("%d",&n)!=EOF)
	{
	if(n>13)
		printf("Overflow!\n");
	else if(n==8)
        printf("40320\n");
	else if(n==9)
		printf("362880\n");
	else if(n==10)
        printf("3628800\n");
	else if(n==11)
        printf("39916800\n");
	else if(n==12)
        printf("479001600\n");
	else if(n==13)
		 printf("6227020800\n");
	else if(n<0)
	{
	if(n%2==0)
          printf("Underflow!\n");
	else
          printf("Overflow!\n");
	}
	else
        printf("Underflow!\n");
	}
return 0;
}