Pick a Sack

You have been given \(n \) sacks having indefinite amount of grains. Except \( 1\) sack every sack has \(10 grams\) weighted grains, and the \( 1 \) exceptional sack has \( 9 grams\) weighted grains. You have been given a weighing machine, in how many minimum number of usage of weighing machine you can identify the sack.

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