n = int(input())
r0 = r1 = float("INF")
for i in range(n):
    x, y = map(float, input().split())
    if (x, y) == (0, 0):
        continue
    r0 = min(r0, x**2+y**2)
for i in range(n):
    x, y = map(float, input().split())
    if (x, y) == (0, 0):
        continue
    r1 = min(r1, x**2+y**2)
print((r1/r0)**(1/2))