s = input().split()
n = int(input())
l = []
c = 0
for v in s:
    l.append(int(v))
for i in range(0, len(l)):
    if n + 30 >= l[i]:
        c += 1
print(c)

/**************************************************************
	Problem: 1388
	User: admin
	Language: Python
	Result: Accepted
	Time:92 ms
	Memory:34480 kb
****************************************************************/