class UnionFind:
    def __init__(self,n):
        self.n = n
        self.parent_size = [-1]*n
 
    def leader(self,a):
        if self.parent_size[a] < 0:
            return a
        self.parent_size[a] = self.leader(self.parent_size[a])
        return self.parent_size[a]
 
    def merge(self,a,b):
        x, y = self.leader(a), self.leader(b)
        if x == y:
            return 
        if abs(self.parent_size[x]) < abs(self.parent_size[y]):
            x, y = y, x
        self.parent_size[x] += self.parent_size[y]
        self.parent_size[y] = x
        return 
 
    def same(self,a,b):
        return self.leader(a) == self.leader(b)
 
    def size(self,a):
        return abs(self.parent_size[self.leader(a)])
 
    def groups(self):
        result = [[] for _ in range(self.n)]
        for i in range(self.n):
            result[self.leader(i)].append(i)
        return [r for r in result if r != []]

N, M = map(int, input().split())
C = list(map(int, input().split()))
edge = [list(map(int, input().split())) for _ in range(M)]

UF = UnionFind(N)
for u, v in edge:
    u, v = u-1, v-1
    if C[u] == C[v]:
        UF.merge(u, v)

D = dict()
for i in range(N):
    if UF.leader(i) != i:
        continue
    color = C[i]
    if color in D:
        D[color] += 1
    else:
        D[color] = 1

ans = 0
for c in D.values():
    ans += c-1

print(ans)