import sys

def MI(): return map(int, sys.stdin.buffer.readline().split())

def main():
    n,m=MI()
    ee=[]
    for e in range(m):
        u,v=MI()
        if u>v:u,v=v,u
        ee.append((u,v))
    vs=0
    for u,v in sorted(ee,reverse=True):
        if vs>>u&1 or vs>>v&1:continue
        vs|=1<<u
    print(bin(vs)[2:])

main()