def ggpl_stairs_and_platform(dx,dy,dz):

    #get steps dimensions
    stepX=dx/2
    stepY=dy/10 #suppose the platform big long as four steps
    stepZ=dz/15

    #counter for height and distance
    countH=stepZ
    countD=stepY
    #building single step
    step=CUBOID([stepX,stepY,stepZ])

    st=step
    #cycle for creating first group of stairs
    while countH<(stepZ*14):
        add_step=T(2)(countD)(step)
        countD+=stepY
        st=STRUCT([st,T(3)(countH),add_step])
        countH+=stepZ

    # creating the platform and using T transform
    platform=CUBOID([dx,4*stepY,stepZ])
    platform=T(2)(countD)(platform)

    #adding platform to struct
    st=STRUCT([st,T(3)(countH),platform])

    VIEW(st)