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