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        function Matematika()
        {
            var Kiekiai, Kainos, Sumos, Koeficientai, SumosSuPapild, KainosSuPapild, Kainos_LTL = new Array();
            var BendrasSvoris = 0, TransportoKaina = 0, TransportoKainaOrig = 0, KituIsladuKaina = 0, KituIsladuKainaOrig = 0, Nuolaida = 0, NuolaidaOrig = 0, VisaSuma = 0, TransportoKainaLTL = 0, PapildomuIslaiduKainaLTL = 0, KainosKoeficientas = 0;
            var ProcentineNuolaida = false, ProcentinisTransportas = false;

            for (var i = 0; i <= 20; i++)
            {
                if (document.getElementById('kaina' + i) && document.getElementById('kaina' + i).value)
                {
                    Kiekiai[i] = parseFloat(document.getElementById('kiekis' + i).value);
                    Kainos[i] = parseFloat(document.getElementById('kaina' + i).value.replace(',', '.'));

                    BendrasSvoris = BendrasSvoris + parseFloat(document.getElementById('svoris' + i).value.replace(',', '.')) * Kiekiai[i];

                    if (document.getElementById('valiuta' + i).value == "EUR" || document.getElementById('valiuta' + i).value == "eur")
                    {
                        s_suma[i].value = Kiekiai[i] * Kainos[i] * 3.4528;
                        Sumos[i] = Kiekiai[i] * Kainos[i] * 3.4528;
                        Kainos_LTL[i] = Kainos[i] * 3.4528;
                    }
                    else if (document.getElementById('valiuta' + i).value == "LTL" || document.getElementById('valiuta' + i).value == "ltl")
                    {
                        s_suma[i].value = Kiekiai[i] * Kainos[i];
                        Sumos[i] = Kiekiai[i] * Kainos[i];
                        Kainos_LTL[i] = Kainos[i];
                    }
                    else
                    {
                        var temp = parseFloat(document.getElementById('valiuta' + i).value);
                        s_suma[i].value = Kiekiai[i] * Kainos[i] * temp;
                        Sumos[i] = Kiekiai[i] * Kainos[i] * temp;
                        Kainos_LTL[i] = Kainos[i] * temp;
                    }
                }
            }

            if(document.getElementById('s_transportas') && document.getElementById('s_transportas').value)
            {
                TransportoKainaOrig = parseFloat(document.getElementById('s_transportas').value.replace(',', '.'));

                if(document.getElementById('tra_valiuta').value == "EUR" || document.getElementById('tra_valiuta').value == "eur")
                {
                    var temp = parseFloat(document.getElementById('s_transportas').value.replace(',', '.'));
                    TransportoKaina = temp * 3.4528;
                }
                else if(document.getElementById('tra_valiuta').value == "LTL" || document.getElementById('tra_valiuta').value == "ltl")
                {
                    TransportoKaina = parseFloat(document.getElementById('s_transportas').value.replace(',', '.'));
                }
                else if(document.getElementById('tra_valiuta').value == "%")
                {
                    TransportoKaina = parseFloat(document.getElementById('s_transportas').value.replace(',', '.')) / 100;
                    ProcentinisTransportas = true;
                }
                else
                {
                    var temp1 = parseFloat(document.getElementById('s_transportas').value.replace(',', '.'));
                    var temp2 = parseFloat(document.getElementById('tra_valiuta').value.replace(',', '.'));
                    TransportoKaina = temp1 * temp2;
                }
            }

            if(document.getElementById('s_kt') && document.getElementById('s_kt').value)
            {
                KituIsladuKainaOrig = parseFloat(document.getElementById('s_kt').value.replace(',', '.'));

                if(document.getElementById('kt_valiuta').value == "EUR" || document.getElementById('kt_valiuta').value == "eur")
                {
                    var temp = parseFloat(document.getElementById('s_kt').value.replace(',', '.'));
                    KituIsladuKaina = temp * 3.4528;
                }
                else if(document.getElementById('kt_valiuta').value == "LTL" || document.getElementById('kt_valiuta').value == "ltl")
                {
                    KituIsladuKaina = parseFloat(document.getElementById('s_kt').value.replace(',', '.'));
                }
                else
                {
                    var temp1 = parseFloat(document.getElementById('s_kt').value.replace(',', '.'));
                    var temp2 = parseFloat(document.getElementById('kt_valiuta').value.replace(',', '.'));
                    KituIsladuKaina = temp1 * temp2;
                }
            }

            if(document.getElementById('s_nuolaida') && document.getElementById('s_nuolaida').value)
            {
                Nuolaida = parseFloat(document.getElementById('s_nuolaida').value.replace(',', '.'));
                NuolaidaOrig = Nuolaida;

                if(document.getElementById('nuolaid_valiuta').value == "EUR" || document.getElementById('nuolaid_valiuta').value == "eur")
                {
                    var temp = parseFloat(document.getElementById('s_nuolaida').value.replace(',', '.'));
                    Nuolaida = temp * 3.4528;
                }
                else if(document.getElementById('nuolaid_valiuta').value == "LTL" || document.getElementById('nuolaid_valiuta').value == "ltl")
                {
                    Nuolaida = parseFloat(document.getElementById('s_nuolaida').value.replace(',', '.'));
                }
                else if(document.getElementById('nuolaid_valiuta').value == "%")
                {
                    Nuolaida = parseFloat(document.getElementById('s_nuolaida').value.replace(',', '.')) / 100;
                    ProcentineNuolaida = true;
                }
                else
                {
                    var temp1 = parseFloat(document.getElementById('s_nuolaida').value.replace(',', '.'));
                    var temp2 = parseFloat(document.getElementById('nuolaid_valiuta').value.replace(',', '.'));
                    Nuolaida = temp1 * temp2;
                }
            }

            var PapildomuIslaiduSuma = KituIsladuKaina + TransportoKaina;
            var KainuSuma = 0;

            for (var i = 0; i <= 20; i++)
            {
                KainuSuma += Sumos[i];
            }

            VisaSuma = KainuSuma + KituIsladuKainal

            if (!ProcentinisTransportas)
            {
                VisaSuma += TransportoKaina;
            }
            else
            {
                TransportoKaina = KainuSuma * TransportoKaina;
                VisaSuma += TransportoKaina;
            }

            if (!ProcentineNuolaida)
            {
                VisaSuma -= Nuolaida;
            }
            else
            {
                Nuolaida = KainuSuma * Nuolaida;
                VisaSuma -= Nuolaida;
            }

            KainosKoeficientas = VisaSuma / KainuSuma;

            for (var i = 0; i <= 20; i++)
            {
                if (Sumos[i] > 0)
                {
                    Koeficientai[i] = Sumos[i] / KainuSuma;
                    s_koeficientas[i].value = Koeficientai[i];
                }
            }

            for (var i = 0; i <= 20; i++)
            {
                if (Koeficientai[i] > 0)
                {
                    SumosSuPapild[i] = Koeficientai[i] * VisaSuma;
                    s_suma_su_papild[i].value = SumosSuPapild[i];

                    KainosSuPapild[i] = SumosSuPapild[i] / Kiekiai[i];

                    var a = document.getElementById('s_kaina_su_papild' + i);
                    a.value = (Kainos_LTL[i] * KainosKoeficientas).toFixed(2);
                }
            }

            transportas_in.value = TransportoKainaOrig;
            kitos_isl_in.value = KituIsladuKainaOrig;
            nuolaida_in.value = NuolaidaOrig;

            viso.value = VisaSuma.toFixed(2);
            bendr_svoris_in.value = BendrasSvoris;
            transportas_ltl_in.TransportoKaina.toFixed(2);
            papild_islaidos_ltl_in.value = (KituIsladuKaina + TransportoKaina).toFixed(2);

            koef_in.value = KainosKoeficientas.toFixed(2);

            return false;
        }