import sys
input = sys.stdin.readline

N = int(input())
A, B = [0] * N, [0] * N
for i in range(N):
    A[i], B[i] = map(int, input().split())
    
def f(x):
    ma = mi = A[0] + B[0] * x
    for i in range(1, N):
        ma = max(ma, A[i] + B[i] * x)
        mi = min(mi, A[i] + B[i] * x)
    return ma - mi

def df(x):
    return f(x+1) - f(x) >= 0

if df(1):
    print(1)
    exit()
    
no = 1
yes = 10 ** 18
while yes - no != 1:
    mid = (yes + no)//2
    if df(mid):
        yes = mid
    else:
        no = mid
        
print(yes)