Escape velocity from Mars

Compute the escape velocity from the surface of Mars, which has mass $6.42\cdot 10^{23}\mathrm{kg}$ and radius $3.39\cdot 10^6\mathrm{m}$, neglecting the atmosphere and the rotation ($G=6.67\cdot 10^{-11}\mathrm{N}\cdot {\mathrm{m}}^2/k{\mathrm{g}}^2$).