C# basic program

Hi Here is your question: Given the following: • Thirty days has September, April, June and November. All the rest have thirty-one, Saving February alone, Which has twenty-eight, rain or shine. And on leap years, twenty-nine. • 1 Jan 1900 was a Monday. • A leap year occurs on any year evenly divisible by 4, but not on a century unless it is divisible by 400. How many Sundays fell on the first of the month during the twentieth century (1 Jan 1901 to 31 Dec 2000)? I need a C# written program in console which would output how many Sundays land on the 1st day of the month between 1901 and 2000 century Please when writing a solution can you not use the DateTime library as i'm looking for a more low level solution Thanks