Surface of Angular Land

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The area of ​​Angular Land is described by inequalities | x + 5y − 28 | ≤30 and | 3x + 5y −34 | ≤30, where the point with coordinates (x, y) is the point distant x kilometers east of a certain reference point (in the case of x negative, this is a point | x | kilometers west) and y kilometers north (or | y | kilometers south in the case of negative y) from this reference point. The altitude of the point of the Angular Land with coordinates (x, y) expressed in meters above sea level is given by the formula h = 2 || x + 5y − 28 | + | 3x + 5y − 34 | −15 | −3− | x + 5y -28 | - | 3x + 5y-34 |. Calculate the area of ​​Angular Land lying in depression (i.e. below sea level). Enter the integer part of this number.