Given are $n$ points with different abscissas in the plane. Through every pair points is drawn a parabola - a graph of a square trinomial with  leading coefficient equal to $1$. A parabola is called $good$ if there are no other marked points on it, except for the two through which it is drawn, and there are no marked points above it (i.e. inside it).  What is the greatest number of $good$ parabolas?
1. **Transformation of Points**: 
   Given the points \((x_i, y_i)\) in the plane, we perform the transformation \((x_i, y_i) \rightarrow (x_i, y_i - x_i^2)\). This transformation effectively shifts the points such that the parabolas \(y = x^2 + bx + c\) between the original points become straight lines in the transformed plane.

2. **Convex Hull and Good Lines**:
   In the transformed plane, we need to find the maximum number of "good" lines. A line is "good" if it does not pass through any other points and no points lie above it. This is equivalent to finding the maximum number of "good" parabolas in the original plane.

3. **Convex Hull Analysis**:
   Consider the convex hull of the transformed points. The convex hull is the smallest convex polygon that contains all the points. If the convex hull is a \(k\)-gon, then there are \(k\) boundary lines.

4. **Counting Good Lines**:
   Among the \(k\) boundary lines of the convex hull, at most \(k-1\) can be "good". This is because at least one of the boundary lines will have the convex hull above it, making it not "good". 

5. **Upper Bound**:
   Since \(k \leq n\) (the number of points), the maximum number of "good" lines is \(n-1\). This is because the convex hull can have at most \(n\) vertices, and thus at most \(n-1\) "good" lines.

6. **Sharpness of the Bound**:
   This bound is sharp. For example, if the points are chosen on the \(x\)-axis (before the transformation), the convex hull will be a line segment, and there will be exactly \(n-1\) "good" parabolas.

Conclusion:
The greatest number of "good" parabolas is \(n-1\).

The final answer is \(\boxed{n-1}\)