import itertools
x=[0.]*100;y=[0.]*100
while 1:
    n=int(input())
    if n==0:break
    a=0
    for i in range(n):x[i],y[i]=map(float,input().split(','))
    for i,j in itertools.product(range(100),range(100)):
            c=0
            for k in range(n):
                if pow(x[k]-(i/10),2)+pow(y[k]-(j/10),2)<=1.01:c+=1
            if c>a:a=c
    print(a)