def Compress(lst):
    decomp=sorted(list(set(lst)))
    comp={x:i for i,x in enumerate(decomp)}
    return comp,decomp

N=int(input())
L,R=[],[]
for i in range(N):
    x,r=map(int,input().split())
    L.append(x-r)
    R.append(x+r)
comp,decomp=Compress(L+R)
le=len(comp)
imos=[0]*le
for l,r in zip(L,R):
    l,r=comp[l],comp[r]
    imos[l]+=1
    imos[r]-=1
for i in range(1,le):
    imos[i]+=imos[i-1]
ans=max(imos)
print(ans)