1
n, k = map(int, input().split())
2
ans = 0
3
a = [x for x in input().split()]
4
 
5
for x in a:
6
    cnt = 0
7
    for d in x:
8
        if d == '4' or d == '7':
9
            cnt += 1
10
    if cnt <= k:
11
        ans += 1
12
        
13
print(ans)