[en] A wide class of exotic states has been investigated. The aim of this work is the search for multiquark resonant states of Y>1 hypercharge. It was performed by the analysis of invariant mass spectra of systems with exotic quantum numbers. The necessary information was obtained in analysing the pictures from the JINR propane bubble chamber exposed to negative pion and neutron beams of 4.0 and 7.0 GeV/c, respectively. No resonance like enhancements were observed in any of systems of hypercharge up to Y=6. This result was confirmed in a series of experiments of other authors, performed with diverse research technique. The conclusion is: the hypercharge of hadron resonances cannot exceed one-Y<=1