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Consider seven digit number x1,x2,...,x7...

Consider seven digit number `x_1,x_2,...,x_7,` where `x_1,x_2,..,x_7 != 0` having the property that `x_4` is the greatest digit and digits towards the left and right of `x_4` are in decreasing order. Then total number of such numbers in which all digits are distinct is

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