https://www.luogu.com.cn/problem/P1046

"""

P1046 [NOIP2005 普及组] 陶陶摘苹果（python3实现）
https://www.luogu.com.cn/problem/P1046

"""

ans=0

a=list(map(int,input().split()))

b=int(input())

for i in range(10):

       if a[i]<=b+30:
                   ans+=1

print(ans)