#############################################################

import sys
sys.setrecursionlimit(10**7)

from heapq import heappop,heappush
from collections import deque,defaultdict,Counter
from bisect import bisect_left, bisect_right
from itertools import product,combinations,permutations
from math import sin,cos
#from math import isqrt #DO NOT USE PyPy

ipt = sys.stdin.readline
iin = lambda :int(ipt())
lmin = lambda :list(map(int,ipt().split()))

#############################################################

N,M = lmin()
C = lmin()
G = [[] for _ in range(N)]
for _ in range(M):
    u,v = lmin()
    u,v = u-1,v-1
    if C[u] == C[v]:
        G[u].append(v)
        G[v].append(u)

cnt = [0]*(N+1)
visited = [0]*N
for i in range(N):
    if visited[i]:
        continue

    cnt[C[i]] += 1
    visited[i] = 1
    st = [i]
    while st:
        cur = st.pop()
        for nxt in G[cur]:
            if visited[nxt]:
                continue
            visited[nxt] = 1
            st.append(nxt)
    
ans = 0
for i in range(N):
    ans += max(0, cnt[i]-1)

print(ans)