import java.util.Scanner;

public class RadianToDegrees {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        //1. read input > radians
        //2. calculate degrees = radians * 180 / pi
        //3. print > 0
        double radians  =  Double.parseDouble(scanner.nextLine());
        double degrees = radians * 180 / Math.PI;
        System.out. printf("%.0f", degrees);
    }
}