第三题
n=int(input())
mcnt=fcnt=msum=fsum=0
for i in range(n):
g,s=map(int,input().split())
if g==1:
mcnt+=1
msum+=s
elif g==0:
fcnt+=1
fsum+=s
if fcnt+mcnt!=0:
z=(msum+fsum)/(mcnt+fcnt)
print(f'{z:.1f}',end=' ')
else:
print("X",end=' ')
if mcnt!=0:
x=msum/mcnt
print(f'{x:.1f}',end=' ')
else:
print("X",end=' ')
if fcnt!=0:
y=fsum/fcnt
print(f'{y:.1f}',end=' ')
else:
print("X",end=' ')