A proton enters a uniform magnetic field of $0.1\ \text{T}$ with a speed of $2\times10^6\ \text{m/s}$, its velocity making an angle of $60^\circ$ with the field, and it moves along a helix. Take the mass of the proton as $1.67\times10^{-27}\ \text{kg}$ and its charge as $1.6\times10^{-19}\ \text{C}$. The pitch of the helix, in cm, to the nearest integer, is ____.