x/1*3+x/3*5+······+x/2013*2015=2014
(1-1/3+1/3-1/5+.+1/2011-1/2013+1/2013-1/2015)*x/2=2014
(1-1/2015)*x/2=2014
x*2014/(2015*2)=2014
x=4030