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  1. #include <iostream>
  2. #include <cstdio>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int n, d, t, cnt=0;
  7. 	scanf("%d%d", &n, &d);
  8. 	while(n--) {
  9. 		scanf("%d", &t);
  10. 		d-=t;
  11. 		if(n) d-=10, cnt+=2;
  12. 	}
  13. 	if(d<0) printf("-1");
  14. 	else {
  15. 		cnt+=d/5;
  16. 		printf("%d", cnt);
  17. 	}
  18. 	return 0;
  19. }
Success #stdin #stdout 0s 3300KB
comments (?)
stdin
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3 20
2 1 1
stdout
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-1
https://ideone.com/aF5JQW
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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