import java.util.Scanner;

/**
 * 题目描述
 * 写出一个程序,接受一个正浮点数值,输出该数值的近似整数值。如果小数点后数值大于等于5,向上取整;小于5,则向下取整。
 */
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double doubleNum = scanner.nextDouble();
        int intNum =(int) doubleNum;
        if(doubleNum - intNum >=0.5  && doubleNum - intNum < 1){
            intNum ++;
        }
        System.out.println(intNum);
    }
}