import sys

sys.setrecursionlimit(10 ** 6)
from typing import List, Tuple

int1 = lambda x: int(x) - 1
input = lambda: sys.stdin.readline().rstrip('\n')
ii = lambda: int(input())
vi = lambda: list(map(int, input().split()))
vi1 = lambda: list(map(int1, input().split()))


def dbg(*args, **kwargs):
    print(*(repr(arg) for arg in args), *(f'{k}: {repr(v)}' for k, v in kwargs.items()),
          sep='; ', file=sys.stderr, flush=True)


def main():
    n, m = vi()
    adj = [[] for _ in range(n)]
    for i in range(m):
        u, v = vi1()
        adj[u].append(v)
        adj[v].append(u)

    c = [None] * n

    def dfs(i, co):
        nonlocal c
        if c[i] is not None:
            return c[i] == co
        c[i] = co
        for u in adj[i]:
            if not dfs(u, not co):
                return False
        return True

    for i in range(n):
        if c[i] is None:
            if not dfs(i, True):
                return 'No'
    return 'Yes'


def _start():
    if (ret := main()) is not None:
        print(*ret) if isinstance(ret, List) or isinstance(ret, Tuple) else print(ret)


if __name__ == '__main__':
    _start()