n = int(input())
pts = []
for i in range(n):
    a, b = [int(s) for s in input().strip().split()]
    pts.append((a, b))

p1 = pts[0]
p2 = pts[1]

if (p1[0] == p2[0]):
    good = True
    for i in range(n):
        if not (pts[i][0] == p1[0]):
            good = False
            break;
    if good:
        print("YES")
    else:
        print("NO")
else:
    slope = (p1[1] - p2[1]) / (p1[0] - p2[0])
    k = p1[1] - p1[0] * slope
    good = True
    for i in range(n):
        if not (abs(pts[i][0] * slope + k - pts[i][1]) < 0.00001 ):
            good = False
            break
    if good and slope == 0:
        print("YES")
    else:
        print("NO")