n, k = map(int, input().split())
D = list(map(int, input().split()))

D = [d-1 for d in D]

def Find(x, par):
    if par[x] < 0:
        return x
    else:
        par[x] = Find(par[x], par)
        return par[x]

def Unite(x, y, par, rank):
    x = Find(x, par)
    y = Find(y, par)

    if x != y:
        if rank[x] < rank[y]:
            par[y] += par[x]
            par[x] = y
        else:
            par[x] += par[y]
            par[y] = x
            if rank[x] == rank[y]:
                rank[x] += 1

def Same(x, y, par):
    return Find(x, par) == Find(y, par)

def Size(x, par):
    return -par[Find(x, par)]

par = [-1]* n
rank = [0]*n

for i, d in enumerate(D):
    Unite(i, d, par, rank)
c = 0
for i in range(n):
    if par[i] < 0:
        c += -par[i]-1
if k < c:
    print('NO')
    exit()
if (k-c)%2 == 0:
    print('YES')
else:
    print('NO')