while 1:
n, m = map(int, input().split())
if n == 0:
break
l = [*map(int, input().split())]
d = {}
for i in l:
if i in d:
d[i] += 1
else:
d[i] = 1
ans = 0
for i in d.values():
if i > 1:
ans += 1
print(ans)