# http://c...content-available-to-author-only...e.com/q/96687/34718
 
def C(P):
	A=x=y=0;n=len(P)
	for i in range(n):m=-~i%n;a=P[i][0];b=P[i][1];c=P[m][0];d=P[m][1];t=a*d-b*c;A+=t;x+=t*(a+c);y+=t*(b+d)
	k=1/(3*A);print x*k,y*k
 
C([(0.,0.),(1.,0.),(1.,1.),(0.,1.)])
C([(-15.21,0.8),(10.1,-0.3),(-0.07,23.55)])
C([(-39.00,-55.94), (-56.08,-4.73), (-72.64,12.12), (-31.04,53.58), (-30.36,28.29), (17.96,59.17), (0.00,0.00), (10.00,0.00), (20.00,0.00), (148.63,114.32), (8.06,-41.04), (-41.25,34.43)])
 
# 0.5 0.5
# -1.72666666667 8.01666666667
# 5.80104769975 15.0673812762
 
"""P=input()
A=x=y=0;n=len(P)
for i in range(n):m=-~i%n;a=P[i][0];b=P[i][1];c=P[m][0];d=P[m][1];t=a*d-b*c;A+=t;x+=t*(a+c);y+=t*(b+d)
k=1/(3*A);print x*k,y*k"""

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