class UnionFind:
    def __init__(self, n):
        self._n = n
        self._parent = [-1] * n
        self._roots = set(range(n))

    def _find(self, x):
        if self._parent[x] < 0:
            return x
        self._parent[x] = self._find(self._parent[x])
        return self._parent[x]

    def union(self, x, y):
        x, y = self._find(x), self._find(y)
        if x == y:
            return
        if self._parent[y] < self._parent[x]:
            x, y = y, x
        self._parent[x] += self._parent[y]
        self._parent[y] = x
        self._roots.discard(y)

    def same(self, x, y):
        return self._find(x) == self._find(y)
    
    def size(self, x):
        return -self._parent[self._find(x)]

    def members(self, x):
        root = self._find(x)
        return [i for i in range(self._n) if self._find(i) == root]
    
    def all_group_members(self):
        group_members = dict()
        for member in range(self._n):
            root = self._find(member)
            if root not in group_members:
                group_members[root] = []
            group_members[root].append(member)
        return group_members

    def root(self, x):
        return self._find(x)

    def roots(self):
        return self._roots
    
    def group_count(self):
        return len(self.roots())
    
    def group_numbers(self):
        return [self._find(i) for i in range(self._n)]
    
    def __str__(self):
        return '\n'.join(f'{r}: {m}' for r, m in self.all_group_members().items())


N, M = map(int, input().split())
C = list(map(int, input().split()))
uf = UnionFind(N)
for _ in range(M):
    u, v = map(int, input().split())
    u, v = u - 1, v - 1
    if C[u] == C[v]:
        uf.union(u, v)
from collections import defaultdict
d = defaultdict(set)
for i, c in enumerate(C):
    d[c].add(uf.root(i))
ans = 0
for v in d.values():
    ans += len(v) - 1
print(ans)