  Measurements of multiplicity fluctuations of identified hadrons produced in
inelastic p+p interactions at 31, 40, 80, and 158~\GeVc beam momentum are
presented. Three different measures of multiplicity fluctuations are used: the
scaled variance $\omega$ and strongly intensive measures $\Sigma$ and $\Delta$.
These fluctuation measures involve second and first moments of joint
multiplicity distributions. Data analysis is performed using the Identity
method which corrects for incomplete particle identification. Strongly
intensive quantities are calculated in order to allow for a direct comparison
to corresponding results on nucleus-nucleus collisions. The results for
different hadron types are shown as a function of collision energy. A
comparison with predictions of string-resonance Monte-Carlo models: Epos, Smash
and Venus, is also presented.
