from collections import defaultdict

class UnionFind():
    def __init__(self, n):
        self.n = n
        self.parents = [-1] * n

    def find(self, x):
        if self.parents[x] < 0:
            return x
        else:
            self.parents[x] = self.find(self.parents[x])
            return self.parents[x]

    def union(self, x, y):
        x = self.find(x)
        y = self.find(y)

        if x == y:
            return

        self.parents[x] += self.parents[y]
        self.parents[y] = x

    def size(self, x):
        return -self.parents[self.find(x)]

    def same(self, x, y):
        return self.find(x) == self.find(y)

    def members(self, x):
        root = self.find(x)
        return [i for i in range(self.n) if self.find(i) == root]

    def roots(self):
        return [i for i, x in enumerate(self.parents) if x < 0]

    def group_count(self):
        return len(self.roots())

    def all_group_members(self):
        group_members = defaultdict(list)
        for member in range(self.n):
            group_members[self.find(member)].append(member)
        return group_members

    def __str__(self):
        return '\n'.join(f'{r}: {m}' for r, m in self.all_group_members().items())
    
def main():
    N,M = map(int,input().split())
    C = list(map(int,input().split()))
    C_dict = defaultdict(list)
    assert 1 <= N <= 2*10**5
    assert 1 <= M <= min(2*10**5, N*(N-1)//2)
    for i,c in enumerate(C):
        assert 1 <= c <= N
        C_dict[c].append(i)
    uv_set = set()
    uf = UnionFind(N)
    for _ in [0]*M:
        u,v = map(int,input().split())
        assert u != v
        assert (u,v) not in uv_set
        assert (v,u) not in uv_set
        assert 1 <= u <= N
        assert 1 <= v <= N
        uv_set.add((u,v))
        if C[u-1] == C[v-1]:
            uf.union(u-1,v-1)
    # print(C_dict)
    # print(uf)
    ans = 0
    for c in C_dict:
        set_per_c = set()
        for i in C_dict[c]:
            set_per_c.add(uf.find(i))
        ans += len(set_per_c)-1
    print(ans)
    
if __name__ == "__main__":
    main()