N=int(raw_input())
ab=[map(int,raw_input().split()) for i in range(N)]
ab.sort()
left=1
right=1000000000
while left<right:
    #print left,right
    mid=(left+right+1)/2
    maxval1=ab[0][0]+ab[0][1]*mid
    minval1=ab[0][0]+ab[0][1]*mid
    maxval2=ab[0][0]+ab[0][1]*(mid-1)
    minval2=ab[0][0]+ab[0][1]*(mid-1)
    for a,b in ab:
        maxval1=max(maxval1,(a+b*mid))
        minval1=min(minval1,(a+b*mid))
        maxval2=max(maxval2,(a+b*(mid-1)))
        minval2=min(minval2,(a+b*(mid-1)))
#    print mid, maxval2-minval2, maxval1-minval1
    if (maxval2-minval2)>(maxval1-minval1):
        left=mid
    else:
        right=mid-1
print left