  We propose a simple semiclassical method for calculating higher-order
cumulants of current in multichannel mesoscopic conductors. To demonstrate its
efficiency, we calculate the third and fourth cumulants of current for a
chaotic cavity with multichannel leads of arbitrary transparency and compare
the results with ensemble-averaged quantum-mechanical quantities. We also
explain the discrepancy between the quantum-mechanical results and previous
semiclassical calculations.
