import math
import operator

n = int(input())

s = input()
l1 = s.split(" ")
x = int(l1[0])
y = int(l1[1])

sp = {}


for i in range(n-1):
    s = input().split(" ")
    x1 = int(s[0])
    y1 = int(s[1])
    dx = x1-x
    dy = y1-y
    dl = math.sqrt(math.pow(dx,2)+math.pow(dy,2))
    a = math.degrees(math.asin(dy/dl))
    #print(a)
    sp.update({i+2:a})

sorted_tuples = sorted(sp.items(), key=operator.itemgetter(1))
#print(sorted_tuples)
print("1")
print(sorted_tuples[len(sorted_tuples)//2][0])