N=int(raw_input())
ab=[map(int,raw_input().split()) for i in range(N)]
ab.sort()
minval=1000000001
ans=1000000001
for i in range(N):
    for j in range(i+1,N):
        ai,bi=ab[i][0],ab[i][1]
        aj,bj=ab[j][0],ab[j][1]
        ind=1
        if bi!=bj:
            ind=max(1,(aj-ai)/(bi-bj))
        #print aj,"+",ind,"*",bj,"-",ai,"+",ind,"*",bi
        if abs((aj+ind*bj)-(ai+ind*bi))<=minval:
            if abs((aj+ind*bj)-(ai+ind*bi))==minval:
                ans=min(ans,ind)
            else:
                ans=ind
            minval=abs((aj+ind*bj)-(ai+ind*bi))
        ind+=1
        #print aj,"+",ind,"*",bj,"-",ai,"+",ind,"*",bi
        if abs((aj+ind*bj)-(ai+ind*bi))<=minval:
            if abs((aj+ind*bj)-(ai+ind*bi))==minval:
                ans=min(ans,ind)
            else:
                ans=ind
            minval=abs((aj+ind*bj)-(ai+ind*bi))
print ans