program main
    implicit none
    integer(16) :: n, mat(2, 2) = 0, m(2, 2)
    read *, n
    m(1, 1) = 0
    m(2, 1) = 1
    m(1, 2) = 3
    m(2, 2) = 2
    mat(1, 1) = 1
    mat(2, 2) = 1
    do while (n > 0)
        if (mod(n, 2) == 1) then
            mat = mod(matmul(mat, m), 10**9 + 7)
        end if
        m = mod(matmul(m, m), 10**9 + 7)
        n = n / 2
    end do
    print *, mat(1, 1)
end program main