+ Time limit: 1 second + Memory limit: 256 megabytes ---------- Saleh, who has recently finished his first semester, decided to return to his hometown to recover from the fatigue of exams. To find some peace, he agrees to take his uncle's flock of sheep out to pasture. Being very tired, Saleh sleeps for a few hours. Now that Saleh is awake, he wants to count the number of his sheep, but since he is still very tired, he does not want to get up from the ground. Therefore, he counts the total number of sheep's legs. Since Saleh is still tired and cannot use his brain, he asks for your help. Given the total number of sheep's legs, provide the number of sheep to Saleh. # Input In the sole line of input, the number $n$ is given, which represents the total number of sheep's legs. It is guaranteed that every sheep has exactly 4 legs and the given number is correct. # Output In the sole line of output, display the number of sheep. # Constraints + $0 \leq n \leq 10^9$ # Examples ## Sample Input 1 ``` 4 ``` ## Sample Output 1 ``` 1 ``` ## Sample Input 2 ``` 12 ``` ## Sample Output 2 ``` 3 ```