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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main(){
  5. 	int n,d,td = 0,sng;	cin >> n >> d;
  6. 	vector<int> t(n);
  7. 	for(int i=0;i<n;i++){
  8. 		cin >> t[i];
  9. 		td += t[i];
  10. 	}	
  11. 	sng = td;
  12. 	td += (n-1)*10;
  13. 	if(td > d)	cout << "-1";
  14. 	else	cout << (d - sng)/5;
  15. 	return 0;
  16. }
Success #stdin #stdout 0s 5276KB
comments (?)
stdin
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3 30
2 2 1
stdout
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5
https://ideone.com/UNfLqK
language:
C++14 (clang 8.0)
created:
1 day ago
visibility:
public

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