import sys
input=sys.stdin.readline
def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))



N=I()

if N==1:
    print(0)
    exit()
if N==2:
    print(1)
    exit()

X=[0]*N
Y=[0]*N
for i in range(N):
    X[i],Y[i]=MI()

M=10**3+1
M2=M*M

def enc(d,i,j):
    temp=d*M2 + i*M + j
    return temp

def dec(temp):
    d,ij=divmod(temp,M2)
    i,j=divmod(ij,M)
    return d,i,j




# 取り除いた or 消えた
used=[0]*N

L=[0]*(N*(N-1)//2)
k=0

for i in range(N):
    for j in range(i+1,N):
        d=(X[i]-X[j])**2 + (Y[i]-Y[j])**2
        L[k]=enc(d,i,j)
        k+=1

ans=0
L.sort()
S=0

for aaa in L:
    _,i,j=dec(aaa)
    if i==0:
        if used[j]==0:
            ans+=1
            used[j]=1
            S+=1
    if used[i]==0 and used[j]==0:
        used[i]=1
        used[j]=1
        S+=2
    if S==N-1:
        break
        
print(ans)