[en] The energy spectra of cosmic-ray neutrons, protons, and pions were determined at sea level in the range 0.1 - 1000 GeV. The results are based on the measurements of the neutron-multiplicity distributions produced by cosmic hadrons in the Turku spectrometer. Below 0.5 GeV, the values gamma 1.47 + or - 0.04 and 0.8 + or - 0.1 were obtained for the slopes of the neutron and proton spectra. At 1000 GeV, the nucleon spectra are much steeper with gamma 2.79 + or 0.06. The pion spectrum was found to obey the power law with gamma 1.41 + or - 0.05 in the low-energy region up to 30 GeV. Above 500 GeV, the spectrum of pions, containing an admixture of accompanied particles, was found to reach the high energy limit with gamma 2.92 + or - 0.06. 7 references