In the beautiful ski resort of Snowy Pines, there was lots of snowfall this week. On Monday, the depth of the snow increased by 5 inches. On Tuesday, the depth of the snow was twice the depth of Monday. On Wednesday, the depth of the snow increased by another 8 inches. On Thursday, it was a nice sunny day, so 1/3 of the snow melted. If the snow is 2 ft deep by the end of Thursday, how deep was the snow on Sunday?
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