LHC as $\pi p$ and $\pi \pi$ Collider

We propose an experiment at the LHC with leading neutron production.The latter can be used to extract from it the total ${\pi }^{+}p$ cross-sections. With two leading neutrons we can get access to the total ${\pi }^{+}{\pi }^{+}$ cross-sections. In this note we give some estimates and discuss related problems and prospects.