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  1. #include <iostream>
  2. using namespace std;
  3. int main() {
  4. 	int x[7],s=0,n,i,j,k=0;
  5. 	cin>>n;
  6. 	x[2]=x[3]=x[4]=x[5]=0;
  7. 	for(i=0;i<n;i++){
  8. 		cin>>j;
  9. 		x[j]++;
  10. 		s+=j;
  11. 	}
  12. 	if(s>=n*4.5){
  13. 		cout<<0;
  14. 		return 0;
  15. 	}
  16. 	else{
  17. 		while(x[2]!=0&&s<n*4.5){
  18. 			x[2]--;
  19. 			s+=3;
  20. 			k++;
  21. 		}
  22. 		while(x[3]!=0&&s<n*4.5){
  23. 			x[3]--;
  24. 			s+=2;
  25. 			k++;
  26. 		}
  27. 		while(x[4]!=0&&s<n*4.5){
  28. 			x[4]--;
  29. 			s+=1;
  30. 			k++;
  31. 		}
  32. 	}
  33. 	cout<<k;
  34. 	return 0;
  35. }
Success #stdin #stdout 0s 4536KB
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stdin
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4
5 3 3 5
stdout
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1
https://ideone.com/v0Eyjl
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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