The only missing month is February. The sum will be either $$365$$ - $$28$$ or (in leap years) $$366$$ - $$29$$. Both are equal to $$337$$． 
Add the number of days in January March, April, May, June, July, August, September, October, November and December. 

[1] $$334$$ 
[2] $$335$$ 
[3] $$336$$ 
[4] $$337$$ 