Can you solve this riddle?

A farmer had a stone that he used to measure grain on his scale. One day his neighbor borrowed the stone and when he returned it was broken into four pieces. The neighbor was very apologetic but the farmer thanked the neighbor for doing him a big favor. The farmer said that now he can measure his grain in one pound increments starting at one pound all the way to forty pounds (1 2 3 17 29 37 etc.) using these four stones.How much do the four stones weigh?

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