function add(a, b) {

    var c, d, e;

    try {

        c = a.toString().split(".")[1].length;

    } catch (f) {

        c = 0;

    }

    try {

        d = b.toString().split(".")[1].length;

    } catch (f) {

        d = 0;

    }

    return e = Math.pow(10, Math.max(c, d)), (mul(a, e) + mul(b, e)) / e;

}

function sub(a, b) {

    var c, d, e;

    try {

        c = a.toString().split(".")[1].length;

    } catch (f) {

        c = 0;

    }

    try {

        d = b.toString().split(".")[1].length;

    } catch (f) {

        d = 0;

    }

    return e = Math.pow(10, Math.max(c, d)), (mul(a, e) - mul(b, e)) / e;

}

function mul(a, b) {

    var c = 0,

        d = a.toString(),

        e = b.toString();

    try {

        c += d.split(".")[1].length;

    } catch (f) {}

    try {

        c += e.split(".")[1].length;

    } catch (f) {}

    return Number(d.replace(".", "")) * Number(e.replace(".", "")) / Math.pow(10, c);

}

function div(a, b) {

    var c, d, e = 0,

        f = 0;

    try {

        e = a.toString().split(".")[1].length;

    } catch (g) {}

    try {

        f = b.toString().split(".")[1].length;

    } catch (g) {}

    return c = Number(a.toString().replace(".", "")), d = Number(b.toString().replace(".", "")), mul(c / d, Math.pow(10, f - e));

}