UVA 10323.cpp

#include<stdio.h>
int main()
{
    int n;
    while(scanf("%d",&n)==1)
    {
        if(n<8 && n>=0)
            printf("Underflow!\n");
        else if(n<0 && n%2==0)
            printf("Underflow!\n");
        else if(n<0 && n%2!=0)
            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>13)
            printf("Overflow!\n");
    }
    return 0;
}