Puzzle Details

How many gifts, in total, did I receive during the Twelve Days of Christmas - according to the song?

[Ref: ZYPE]

On the first day of Christmas my true love gave to me a partridge in a pear tree (so I received 1 item).

On the second day of Christmas my true love gave to me two turtle doves and a partridge in a pear tree (so I received 3 items).

So:

Day 1  = 1                                                = 1
Day 2  = 1 + 2                                            = 3
Day 3  = 1 + 2 + 3                                        = 6
Day 4  = 1 + 2 + 3 + 4                                    = 10
Day 5  = 1 + 2 + 3 + 4 + 5                                = 15
Day 6  = 1 + 2 + 3 + 4 + 5 + 6                            = 21
Day 7  = 1 + 2 + 3 + 4 + 5 + 6 + 7                        = 28
Day 8  = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8                    = 36
Day 9  = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9                = 45
Day 10 = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10           = 55
Day 11 = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11      = 66
Day 12 = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 = 78

Total = 364

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