You are given the following information, but you may prefer to do some research for yourself.
<ul><li>1 Jan 1900 was a Monday.</li><li>Thirty days has September,<br>April, June and November.<br>All the rest have thirty-one,<br>Saving February alone,<br>Which has twenty-eight, rain or shine.<br>And on leap years, twenty-nine.</li><li>A leap year occurs on any year evenly divisible by 4, but not on a century unless it is divisible by 400.</li>
How many Sundays fell on the first of the month during the twentieth century (1 Jan 1901 to 31 Dec 2000)?