n,m=map(int,input().split())
c=list(map(int,input().split()))
e=[[] for i in range(n)]
for i in range(n):
	u,v=map(int,input().split())
	u-=1
	v-=1
	e[u]+=[v]
	e[v]+=[u]
p=[0]*n
v=[0]*n
for i in range(n):
	if v[i]==0:
		s=i
		g=c[s]
		p[g-1]+=1
		v[s]=1
		q=[s]
		for s in q:
			for t in e[s]:
				if v[t]==0 and c[t]==g:
					v[t]=1
					q+=[t]
print(sum(v-(v>0) for v in p))