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The decays $B^+\rightarrow J/\psi 3\pi^+ 2\pi^-$ and $B^+\rightarrow \psi(2S)\pi^+\pi^+\pi^-$ are observed for the first time using a data samplecorresponding to an integrated luminosity of $3.0fb^{-1}$, collected by theLHCb experiment in proton-proton collisions at the centre-of-mass energies of 7and 8 TeV. The branching fractions relative to that of $B^+ \rightarrow\psi(2S)K^+$ are measured to be \begin{eqnarray*}  \frac {\mathcal{B}\left(B^+\rightarrow J/\psi 3\pi^+ 2\pi^- \right)}  {\mathcal{B}\left(B^+ \rightarrow \psi(2S)K^+ \right)}  & = &  \left(1.88\pm0.17\pm0.09\right)\times10^{-2},  \frac {\mathcal{B}\left(B^+\rightarrow \psi(2S) \pi^+\pi^+\pi^- \right)}  {\mathcal{B}\left(B^+ \rightarrow \psi(2S)K^+ \right)} & = &  \left(3.04\pm0.50\pm0.26\right)\times10^{-2}, \end{eqnarray*} where the firstuncertainties are statistical and the second are systematic.

Observation of $B^+\rightarrow J/\psi 3\pi^+ 2\pi^-$ and $B^+\rightarrow \psi(2S) \pi^+\pi^+\pi^-$ decays