import java.util.*;
import java.math.*;
 
class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int input = sc.nextInt();
        BigDecimal a = new BigDecimal(input);
        BigDecimal b = new BigDecimal(0);
        BigDecimal answer = new BigDecimal(0);
        BigDecimal two = new BigDecimal(2);
      
      
      if(input==1){
        answer = a.divide(a);
      }else{
        b = a.divide(two,0, BigDecimal.ROUND_UP);
        answer = b.divide(a,10, BigDecimal.ROUND_DOWN);
      }
        System.out.println(answer);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz