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class Solution {
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  public int computeArea(int ax1, int ay1, int ax2, int ay2, int bx1, int by1, int bx2, int by2) {
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    int x1 = Math.max(ax1, bx1);
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    int y1 = Math.max(ay1, by1);
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    int x2 = Math.min(ax2, bx2);
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    int y2 = Math.min(ay2, by2);
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    int area = 0;
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    int R1 = (ax2 - ax1) * (ay2 - ay1);
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    int R2 = (bx2 - bx1) * (by2 - by1);
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    area = R1 + R2;
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    if (x2 > x1 && y2 > y1) {
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      int overlap = (x2 - x1) * (y2 - y1);
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      area = area - overlap;
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    }
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    return area;
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  }
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}