from collections import deque
import sys
input = sys.stdin.readline

N, M = map(int, input().split())
C = list(map(int, input().split()))
graph = [[] for _ in range(N)]
for i in range(M):
    u, v = map(int, input().split())
    u -= 1
    v -= 1
    if C[u] == C[v]:
        graph[u].append(v)
        graph[v].append(u)

ans = 0
Clen = [0 for _ in range(N + 1)]
for i in range(N):
    Clen[C[i]] += 1
isvisited = [False for _ in range(N)]
dq = deque()
for i in range(N):
    if isvisited[i]:
        continue
    isvisited[i] = True
    dq.append(i)
    while len(dq):
        Clen[C[i]] -= 1
        p = dq.popleft()
        for x in graph[p]:
            if isvisited[x]:
                continue
            isvisited[x] = True
            dq.append(x)
    Clen[C[i]] += 1
# print(Clen)
for i in range(1, N + 1):
    ans += max(0, Clen[i] - 1)
print(ans)