Write a c program to find out what is the day on 1st January of input year.

https://www.easterscience.com/q4-according-to-the-gregorian-calendar-it-was-monday-on-the-date-01-01-01-if-any-year-is-input-through-the-keyboard-write-a-program-to-find-out-what-is-the-day-on-1st-january-of-this-year/