package open;
import java.util.Scanner;
public class main {

	public main() {
	
	}

	public static void main(String[] args) {
		double a,c; String b;
		Scanner sc = new Scanner(System.in);
		a=sc.nextDouble();
		b=sc.next();
		if(b.equals("sin")) {
			sanjiao d=new sanjiao();
			System.out.println(d.sanjiao("sin", a));
		}
		else if(b.equals("cos")) {
			sanjiao d=new sanjiao();
			System.out.println(d.sanjiao("cos", a));
		}
		else if(b.equals("tan")) {
			sanjiao d=new sanjiao();
			System.out.println(d.sanjiao("tan", a));
		}
		else if(b.equals("^")) {
			zhishu d=new zhishu();
			System.out.println(d.zhishu(a));
		}
		else if(b.equals("log")) {
			duishu d=new duishu();
			c=sc.nextDouble();
			System.out.println(d.duishu(a, c));
		}
		else if(b.equals("+")) {
			sizeyunsuan d=new sizeyunsuan();
			c=sc.nextDouble();
			System.out.println(d.add(a, c));
		}
		else if(b.equals("-")) {
			sizeyunsuan d=new sizeyunsuan();
			c=sc.nextDouble();
			System.out.println(d.subtract(a, c));
		}
		else if(b.equals("*")) {
			sizeyunsuan d=new sizeyunsuan();
			c=sc.nextDouble();
			System.out.println(d.multiply(a, c));
		}
		else if(b.equals("/")) {
			sizeyunsuan d=new sizeyunsuan();
			c=sc.nextDouble();
			System.out.println(d.divide(a, c));
		}
		else System.out.println("´يخَ");
	}

}