According to the traditional song, on the first day of Christmas (25th December), my true friend sent to me:
A partridge in a pair tree

On the second day of Christmas (26th December), my true friend sent to me THREE presents:
Two turtle doves
A partridge in a pear tree

On the third day of Christmas (27th December and so on) my true friend sent to me SIX presents:
Three French hens’
Two turtle doves
A partridge in a pear tree

This carries on until the twelfth day of Christmas, when my true friend sends me:
Twelve drummers drumming
Eleven pipers piping
Ten lords a-leaping
Nine ladies dancing
Eight maids a-milking
Seven swans a-swimming
Six geese a-laying
Five gold rings
Four calling birds
Three French hens
Two turtle doves
A partridge in a pear tree

After the twelve days of Christmas are over, how many presents has my true friend sent me altogether?