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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int N;
  6. 	cin >> N;
  7. 	int arr[3]={N,N,N}; // 18 21 25
  8. 	int ans=0;
  9. 	while(arr[2]>=2){
  10. 		arr[2]-=2;
  11. 		ans++;
  12. 	}
  13. 	if(arr[2]==1){
  14. 		arr[1]--;
  15. 		ans++;
  16. 	}
  17. 	while(arr[0]>0 || arr[1]>0){
  18. 		if(arr[0]>arr[1]){
  19. 			arr[0]-=2;
  20. 			arr[1]-=1;
  21. 			ans++;
  22. 		}else{
  23. 			arr[0]-=1;
  24. 			arr[1]-=2;
  25. 			ans++;
  26. 		}
  27. 	}
  28. 	cout << ans << '\n';
  29. }
  30. /*
  31. 60
  32. 25+25 500
  33. 25+21
  34. 25+18
  35. 21+21+18 
  36. 21+18+18 
  37. 18+18+18*/
  38.  
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin 
1000
stdout 
1167
https://ideone.com/aw3kKv
language:
C++14 (gcc 8.3)
created:
22 hours ago
visibility:
public

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