BASE = 2*10**5
N = int(input())
A = [0]*(4*BASE+1)
for _ in range(N):
    x,r = map(int,input().split())
    A[2*(x+BASE-r)+1] += 1
    A[2*(x+BASE+r)] -= 1
for i in range(1,4*BASE+1):
    A[i] += A[i-1]
print(max(A))