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#!/usr/bin/perl
use strict;
use warnings;
use DateTime;
my $day = DateTime->new(year => 1901, month => 1, day => 1);
my $count = 0;
while ($day->year < 2001) {
$count++ if $day->day_of_week == 7 && $day->day_of_month == 1;
$day->add(days => 1);
}
print "$count\n";
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