with open('input.txt', 'r') as InputFile:
         a, b = InputFile.read().split()
a = int(a); b=int(b)
max = 1
i = 1
while(b!=0):
    if(a==b):
        i+=1
    elif(a!=b):
        if(i>max):
            max=i
            i=1
        else:
            i=1
    a=b
    b = InputFile.read()
if(max>i):
    with open('output.txt', 'w') as OutputFile:
        OutputFile.write(str(max))
else:
    with open('output.txt', 'w') as OutputFile:
        OutputFile.write(str(i))