import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double d= scanner.nextDouble();
        //write your code here......
        int i=(int)d;
        if ((d-i)>0.5){
            i=i+1;
        }
        System.out.println(i);
    }
}