#include <stdio.h>
double fun ( int i )
{
    double re = 2.5, to = 6;
    int n;
    for ( n = 3; n <= i; n++ )
    {
        re += 1 / to;
        to *= ( n + 1 );
    }
    return re;
}
int main()
{
    int i;
    printf ( "n e\n" );
    printf ( "- -----------\n" );
    printf ( "0 1\n1 2\n2 2.5\n" );
    for ( i = 3; i <= 9; i++ )
        printf ( "%d %.9lf\n", i, fun ( i ) );
    return 0;
}