def katamuki(x1,y1,x2,y2):
    if (x2-x1) == 0:
        k=None
    else:
        k=(y2-y1)/(x2-x1)
    return k

def seppen(x,y,k):
    c=y-k*x
    return c

N=int(input())
X=[]
Y=[]
count=0
for i in range(N):
    x,y=map(int, input().split())
    if x:
        X.append(x)
        Y.append(y)

for i in range(len(X)):
    for j in range(i+1,len(X)):
        k=katamuki(X[i],Y[i],X[j],Y[j])
        if k==None:
            c=0
        else:
            c=seppen(X[i],Y[i],k)
        for l in range(j+1,len(X)):
            if k*X[l]+c-Y[l] == 0:
                count+=1

print(count+2)