262A - Roma and Lucky Numbers

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  1. 262A - Roma and Lucky Numbers

  3. #include<bits/stdc++.h>
  4. using namespace std;
  5. int main()
  6. {
  7. int n,k,c=0,ans=0;
  8. cin>>n>>k;
  9. while(n--)
  10. { c=0;
  11. string s;
  12. cin>>s;
  13. for(int i=0;i<s.length();i++){
  14. if(s[i]=='4' or s[i]=='7')
  15. c++;
  16.  
  17. }
  18. if(c<=k) ans++;
  19.  
  20.  
  21. } cout<<ans;
  22. return 0;
  23. }

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