import sys
input = sys.stdin.readline
N = int(input())
XY = [tuple(map(int,input().split())) for i in range(N)]
XY.sort(key=lambda x:x[0]**2 + x[1]**2)

ans = 0
for i in range(50):
    if len(XY) < 2: break
    x1,y1 = XY.pop()
    for x2,y2 in XY:
        ans = max(ans, abs(x1*y2 - x2*y1))
print(ans)