import sys
sys.setrecursionlimit(10 ** 6)

def dfs(now, g, visited):
    visited[now] = True
    for nex in g[now]:
        if visited[nex]:
            continue
        dfs(nex, g, visited)

n, m = map(int, input().split())
g = [[] for _ in range(n)]
c = list(map(int, input().split()))
for _ in range(m):
    u, v = map(int, input().split())
    u -= 1
    v -= 1
    if c[u] == c[v]:
        g[u].append(v)
        g[v].append(u)

com = [0] * n
visited = [False] * n
for i in range(n):
    if not visited[i]:
        dfs(i, g, visited)
        com[c[i] - 1] += 1

ans = 0
for i in range(n):
    if com[i] != 0:
        ans += com[i] - 1

print(ans)