package calculator;
import java.util.*;
import java.math.*;

public class Calculate {

	public static void main(String[] args) {
		
		//System.out.println("function:");  /*输入函数符号*/
		Scanner function= new Scanner(System.in);	/*输入角度数*/
		String str=function.nextLine();
		
		//System.out.println("radian:");
		Scanner radian= new Scanner(System.in);
		double d=radian.nextDouble();
		
		if(str.equals("sin")) {
			System.out.println("="+Math.sin(Math.toRadians(d)));
		}
		else if(str.equals("cos")) {
			System.out.println("="+Math.cos(Math.toRadians(d)));
		}
		else if(str.equals("tan")) {
			System.out.println("="+Math.tan(Math.toRadians(d)));
		}
		else System.out.println("Error!");
		
		
	}
}