import sys # sys.setrecursionlimit(200005) int1 = lambda x: int(x)-1 pDB = lambda *x: print(*x, end="\n", file=sys.stderr) p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr) def II(): return int(sys.stdin.readline()) def LI(): return list(map(int, sys.stdin.readline().split())) def LLI(rows_number): return [LI() for _ in range(rows_number)] def LI1(): return list(map(int1, sys.stdin.readline().split())) def LLI1(rows_number): return [LI1() for _ in range(rows_number)] def SI(): return sys.stdin.readline().rstrip() # dij = [(0, 1), (-1, 0), (0, -1), (1, 0)] dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)] inf = (1 << 63)-1 # inf = (1 << 31)-1 # md = 10**9+7 md = 998244353 n,m=LI() to=[[] for _ in range(n)] for _ in range(m): u,v=LI1() to[u].append(v) to[v].append(u) color=[-1]*n for u in range(n): if color[u]==-1: ok=0 color[u]=0 st=[u] while st and ok==0: u=st.pop() for v in to[u]: if color[v]==-1: color[v]=color[u]^1 st.append(v) elif color[v]==color[u]: ok=1 break if ok==0: print("No") exit() print("Yes")