Plot[UnitStep[x]+UnitStep[x-2]+UnitStep[x-3]+UnitStep[x-4]+UnitStep[x-5],{x,-8,10}]


Plot[UnitStep[x]+UnitStep[x-3]+UnitStep[x-5]+UnitStep[x-7]+UnitStep[x-12],{x,-8,10}]


Plot[UnitStep[x^2]+UnitStep[x^2-2]+UnitStep[x^2-3]+UnitStep[x^2-4]+UnitStep[x^2-5],{x,-8,10}]


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