Bifurcation diagram of discrete SIR model in MATLAB

Question

My model is: S(n+1) = S(n) - h*(0.01+betaS(n)I(n)+dS(n)-gammaR(n))

I(n+1) = I(n) + hbetaS(n)I(n) - h(d+r)*I(n)

R(n+1) = R(n