linear depedence

n=int(input())
ilosc=0
wektory=[]
for i in range(n):
    linia=input().split()
    wektory.append(linia)
for i in range(n):
    kolumna=[]
    for j in range(n):
        kolumna.append(wektory[j][i])
    wektory.append(kolumna)
for i in range(0,2*n-1):
    for j in range(i+1,2*n):
        flaga=True
        wektor1=[int(x) for x in wektory[i]]
        wektor2=[int(x) for x in wektory[j]]
        if(sum(wektor1)==0 or sum(wektor2)==0): 
            if(sum(wektor1)==0 and sum(wektor2)==0): flaga=True
            else: flaga=False
        else:
            for h in range(n):
                if(wektor2[h]!=0):
                    wartosc=h
                    break
            if(wektor1[wartosc]==0): flaga=False
            else:
                for h in range(n):
                    if((wektor2[h]*wektor1[wartosc])/wektor2[wartosc]!=wektor1[h]): flaga=False
        if(flaga==True):
            ilosc=ilosc+1
print(ilosc)