code = r"""
# distutils: language=c++
from libcpp cimport bool
from libcpp.vector cimport vector
cdef extern from "atcoder.hpp" namespace "atcoder":
    cdef cppclass dsu:
        dsu(int n)
        int merge(int a, int b)
        bool same(int a, int b)
        int leader(int a)
        int size(int a)
        vector[vector[int]] groups()
from libc.stdio cimport getchar, printf
cdef inline int read():
    cdef int b, c = 0
    while 1:
        b = getchar() - 48
        if b < 0: return c
        c = c * 10 + b
cdef int n = read(), m = read(), i, a, t
cdef dsu *d = new dsu(n)
for i in range(m): d.merge(read() - 1, read() - 1)
cdef vector[vector[int]] g = d.groups()
for i in range(g.size()):
    t = g[i].size()
    if t > a: a = t
printf('%d\n', a)
"""
import sys
if sys.argv[-1] == 'ONLINE_JUDGE':
    import os, zlib, base64
    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    open('solve.pyx', 'w').write(code)
    os.system('cythonize -i -3 -b solve.pyx')
import solve

Measured memory_bytes: 23340