Happy tickets!

A bus ticket form \(\overline{a_{1}a_{2}a_{3}a_{4}a_{5}a_{6}}\) in which \(0 \leqslant a_{i} \leqslant 9\).Tickets \(\overline{a_{1}a_{2}a_{3}a_{4}a_{5}a_{6}}\) are called happy ticket if \(a_{1} + a_{2} + a_{3} = a_{4} + a_{5} + a_{6}\).

Find how many happy tickets from 000000 to 999999?

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