Holi is celebrated in India as a festival of colours and your friend Khan from India has gifted you X packets of colours. Now you are planning to make a beautiful rangoli, to make it you need to map all colours pairwise distinct, so that they look attractive. To do so, you can mix the colours zero or more times: Pick any two random colours. Let's denote their weight by t and u. Mix the colour with second colour. After the process, the value of the first colour remains t, but the weight of the second colour changes to t + u. Now you have to develop the code to find the minimum number of mixing operations you needs to wwww perform to make a beautiful Rangoli.

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