N = int(input())
dolls = []
for i in range(N):
	r, R = map(int, input().split())
	dolls.append((r, R))

dolls.sort()

ans = 0
last = dolls[0]
for i in range(1, N):
	if last[1] > dolls[i][0]:
		ans += 1
	else:
		last = dolls[i]
print(ans)