  We investigate theoretically baryon systems made of three hadrons which
contain one nucleon and one D meson, and in addition another meson, $\bar{D},
K$ or $\bar{K}$. The systems are studied using the Fixed Center Approximation
to the Faddeev equations. The study is made assuming scattering of a $K$ or a
$\bar{K}$ on a $DN$ cluster, which is known to generate the $\Lambda_c(2595)$,
or the scattering of a nucleon on the $D\bar{D}$ cluster, which has been shown
to generate a hidden charm resonance named X(3700). We also investigate the
configuration of scattering of $N$ on the $KD$ cluster, which is known to
generate the $D_{s0}^*(2317)$. In all cases we find bound states, with the
$NDK$ system, of exotic nature, more bound than the $\bar{K} DN$.
