백준 9063 대지

n=int(input())
a, b = map(int, input().split())
if n<3:print(0);exit()
minX,minY,maxX,maxY=a,b,a,b
for i in range(n-1):
    a,b=map(int, input().split())
    minX=min(minX,a)
    minY = min(minY, b)
    maxX = max(maxX, a)
    maxY = max(maxY, b)
print((maxX-minX)*(maxY-minY))