N=int(input())
AB=[tuple(map(int,input().split())) for i in range(N)]

def calc(x):
    MIN=1<<64
    MAX=-1<<64

    for a,b in AB:
        MIN=min(a+x*b,MIN)
        MAX=max(a+x*b,MAX)

    return MAX-MIN

MIN=1
MAX=10**18

while MAX>MIN+10:
    x=MIN+(MAX-MIN)//3
    y=MIN+(MAX-MIN)//3*2

    if calc(x)>calc(y):
        MIN=x
    else:
        MAX=y
        

SCORE=1<<64

for i in range(MIN,MAX+1):
    if calc(i)<SCORE:
        ANS=i
        SCORE=calc(i)

print(ANS)