billcost = io.read('*n') --[[billcost is the variable for original cost.--]]
if(billcost >= 5000 and billcost < 10000)--[[checking if original cost is more than 5000 and
 less than 10000--]]
then
    newcost = billcost-500 --[[making variable newcost to keep discount added amount.--]]
    print('The amount that you have to pay is Rs.',newcost)
elseif(billcost >= 10000 and billcost < 15000)--[[checking if original cost is more than 10000
    and less than 15000--]]
then
    newcost = billcost-750--[[updating variable newcost to keep discount added amount.--]]
    print('The amount that you have to pay is Rs.',newcost)
elseif(billcost >= 15000)--[[Checking if original cost is more than 15000.--]]
then
    newcost = billcost-1000--[[updating variable newcost to keep discount added amount.--]]
    print('The amount that you have to pay is Rs.',newcost)
else--[[updating variable newcost to keep discount added amount.--]]
    newcost = billcost
    print('The amount that you have to pay is Rs.',newcost)
end