#include <stdio.h>
#include <math.h>
#include <ctype.h>
#include<string.h>
#define PI 3.14f
#define TSF PI/180

double DegToRad(double deg) //角度轉弳度
{
	double rad = 0;
	while (deg >= 360) deg -= 360;
	rad = deg*TSF;
	return rad;
}

double factorial(int n) //階層
{
	double a = 1;
	for (int i = 1; i <= n; i++)
		a *= i;
	return a;
}

double sine(double x, int n)
{
	int flag = 0;
	double value = 0;
	if (x < 0) x += 360;
	if (x > 180)
	{
		x -= 180;
		flag = 1;
	}
	x = DegToRad(x);
	for (int i = 0; i <= n; i++)
	{
		value += (pow(-1, i)*pow(x, 2 * i + 1) / factorial(2 * i + 1));
		//printf("%.6lf\n", value);
	}
	return (flag) ? -value : value;
}

double cosine(double x, int n)
{
	int flag = 0;
	double value = 0;


	x = DegToRad(x);
	for (int i = 0; i <= n; i++)
	{
		value += (pow(-1, i)*pow(x, 2 * i) / factorial(2 * i));
	}
	return value;
}

int main()
{
	char str[4] = { 0 };
	double x = 0;
	int n = 0;
	while (scanf("%s %lf %d", &str, &x, &n) != EOF)
	{
		for (int i = 0; i < strlen(str); i++)
			str[i] = toupper(str[i]);
		if (str[0] == 'S' && str[1] == 'I' && str[2] == 'N')
			printf("%.6lf", sine(x, n));
		else if (str[0] == 'C' && str[1] == 'O' && str[2] == 'S')
			printf("%.6llf", cosine(x, n));
		else
			printf("Input Error.");
		printf("\n");
	}
	return 0;
}