# def solve(a, b):
# return a+b
#
# print(solve(10, 20))
# def solve(b):
# return data[b-1]+data[i-b+1]
# a = int(input())
# data = [1, 1]
# for i in range(1, a-1):
# data.append(solve(data[i]))
# data.reverse()
# print(data[0])
data = []
e = 0
f = 0
e = int(e)
f = int(f)
def solve(c, d):
data[c] += 1
data[d] += 1
return 0
n, m = input().split()
n = int(n)
m = int(m)
for i in range(n+1):
data.append(0)
for i in range(m):
a, b = input().split()
a = int(a)
b = int(b)
solve(a, b)
for i in range(n):
if data[i+1]%2!=0:
e += 1
if data[i+1]==0:
f += 1
if f > 0:
print("NO")
elif e == 0:
print("YES")
elif e != 2:
print("NO")
else:
print("YES")
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20220508
20220508
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