n, k = list(map(int, input().split()))
w = input().split()
d = 0
for i in range(n):
c = 0
for j in range(len(w[i])):
if w[i][j] == '4' or w[i][j] == '7':
c += 1
if c > k:
d += 1
print(n-d)#include<bits/stdc++.h>
using namespace std;
int main() {
int n, k;
cin >> n >> k;
int ans = 0;
for(int i = 0; i < n; i++) {
string s;
cin >> s;
int c = 0;
for(auto i:s) {
if(i=='4' or i=='7') {
c ++;
}
}
if(c<=k) {
ans ++;
}
}
cout << ans;
}479C - Exams | 1030A - In Search of an Easy Problem |
158A - Next Round | 71A - Way Too Long Words |
160A - Twins | 1A - Theatre Square |
1614B - Divan and a New Project | 791A - Bear and Big Brother |
1452A - Robot Program | 344A - Magnets |
96A - Football | 702B - Powers of Two |
1036A - Function Height | 443A - Anton and Letters |
1478B - Nezzar and Lucky Number | 228A - Is your horseshoe on the other hoof |
122A - Lucky Division | 1611C - Polycarp Recovers the Permutation |
432A - Choosing Teams | 758A - Holiday Of Equality |
1650C - Weight of the System of Nested Segments | 1097A - Gennady and a Card Game |
248A - Cupboards | 1641A - Great Sequence |
1537A - Arithmetic Array | 1370A - Maximum GCD |
149A - Business trip | 34A - Reconnaissance 2 |
59A - Word | 462B - Appleman and Card Game |