def not_al():
    global vize1,vize2,final
    vize1=0
    vize2=0
    final=0
    global ogrenci
    ogrenci=0
    i=True
    while i:
        p=input()
        if p=='x':
            pass
        elif p!='end':
            vize1+=int(p)
            ogrenci+=1
            vize2+=int(input())
            final+=int(input())
        elif p=='x':
            pass
        elif p=='end':
            i=False

def ortalama_hesapla(a,b,c):
    global v1,v2,f
    v1=a/ogrenci
    v2=b/ogrenci
    f=c/ogrenci
def ortalama_bas():
    print(ogrenci)
    print(v1)
    print(v2)
    print(f)

not_al()
ortalama_hesapla(vize1,vize2,final)
ortalama_bas()