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Hi,
And if you want, you can try making a little program  and modify it
 and modify it
(JavaScript)
var x = 1;
var y = 2;
var days = 1;
var PresentsPerDay = 0;
while (days < 13){
  PresentsPerDay=x+PresentsPerDay;
  x=x+y;
  y++;
  days++;
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