Problems
Three rectangles
Three rectangles
Three rectangles are painted on the white sheet of paper so that their sides lie on the grid lines and the vertices have integer coordinates. Find the total number of painted cells.
\includegraphics{https://static.e-olymp.com/content/f9/f96dde145775c06574fd8c9b2e9099ca35856fd0.png}
\InputFile
Three lines contain four integers --- the coordinates of two opposite vertices of each rectangle (the coordinates do not exceed $100$ by absolute value).
\OutputFile
Print the number of painted cells.
Input example #1
2 2 5 6 3 3 7 1 6 4 4 7
Output example #1
22