Finding the number of days in a given year

Ok, so i need to figure this one out, been at it for a few days now, but not having much luck with it.
Ok, so i have:
public class Project3 {
public static void main(String [] args) {
String enteryear = JOptionPane.showInputDialog(null, "Enter a year");
int yearnum = Integer.parseInt(enteryear);
so, what i need to do is display an output saying :
"The year" + enteryear + " has " + days + " in it"
my problem is that i can not use if then or any other advanced statements, only simple math
I am having some problems figuring out how to do this.
I have to keep in mind leap years and follow the rules for finding out if a year is a leap year:
Div by 4? leap year
Div by 100? Not a leap year
Div by 400? Leap year
but from here, im lost as to how to fit the mnath formula needed.

There are 365 days in a year. To be exact, there are
365.25 days in a year.Approximately.
Time drifts according to our precetion of importance.
What I mean, is that there is no such thing as a leap
anything. We created it (time) to suit our needs -
and is not very acuurate on the overall picture.Er, no. One revolution around the sun is not an integer number of rotations of the earth on its axis. That remainder is the physical basis for leap years and leap seconds.
Adding time would have extended our current day to be
well over 1,000,000 hours long since 'time' started.WTF are you talking about? Can I have some of whatever you're smoking?
Even trying to use to for the most scientifically
demanding task of placing objects in space at a
certain time would not be off by not figuring in time
drift since any time gained would eventually be lost
again - which is an enigma since time's speed is
constant, and we invented time to begin with.Seriously dude, you want some Doritos?

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