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We report the first observation of a number of decay modes of the B meson,namely $B^0 \to D^{*-} (5\pi)^+$, $B^+ \to D^{*-} (4\pi)^{++}$ and $B^+ \to\bar{D}^{*0} (5\pi)^+$, where $(n\pi)$ implies the combination of n chargedpions. The analysis is based on a 140 fb$^{-1}$ data sample collected at the$\Upsilon(4S)$ resonance with the Belle detector at KEKB. We measure${\cal{B}}(B^0 \to D^{*-} (5\pi)^+) = (4.72 \pm 0.59 \pm 0.71) \times 10^{-3}$,${\cal{B}}(B^+ \to D^{*-} (4\pi)^{++} = (2.56 \pm 0.26 \pm 0.33) \times10^{-3}$ and ${\cal{B}}(B^+ \to \bar{D}^{*0} (5\pi)^+) = (5.67 \pm 0.91 \pm0.85) \times 10^{-3}$. We also provide improved measurements of the branchingfractions for the decay modes $B^0 \to D^{*-} (3\pi)^+$, $B^+ \to \bar{D}^{*0}(3\pi)^+$ and $B^0 \to \bar{D}^{*0} (4\pi)^0$.Comment: 5 pages, 2 figures, Typo. KEK Preprint 2004-45, Belle Preprint  2004-25, submitted to PRD(R

Observation of B0→D*-(5π)+, B+→D*-(4π)++ and B+→D¯*0 (5π)+

Observation of B0→D-(5π)+, B+→D-(4π)++ and B+→D¯*0 (5π)+