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);
}

}