from sys import setrecursionlimit
from collections import defaultdict
setrecursionlimit(10**9)

def dfs(pos):
    if pos in visited: return
    visited.add(pos)

    for i in g[pos]:
        dfs(i)

n,m = map(int,input().split())
c = list(map(int,input().split()))
d = defaultdict(int)

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

visited = set()
for i in range(n):
    if i not in visited:
        dfs(i)
        d[c[i]] += 1

ans = 0
for i in d.values():
    ans += (i - 1)

print(ans)