import java.util.Scanner;
public class Main{
    public static void main(String agrs[]){
        Scanner in = new Scanner(System.in);
        //System.out.println("输入一个正浮点数值");
        float f = in.nextFloat();
        int i = 0;
        if((f*10%10)<5){
            i=(int)(f);
        }else{
            //i=(int)(f+1);
            i=(int)(f)+1;
        }
        System.out.println(i);
    }
}