program main
    integer n
    read *, n
    write (6,fmt='(I0)') combination(n, 4)*int(26**(n-4))
contains
    integer function combination(n, r)
        integer n, r, i, ans
        r = min(r, n-r)
        ans = 1
        do i = n - r + 1, n
            ans = ans * i
        end do
        do i = 1, r
            ans = ans * i
        end do
        combination = ans
    end function combination
end program main