class Program01 {
	public static double pow(double a, double b){
		if(b == 0){
			return 1;
		}
		if(b==1){
			return a;
		}
		double tmp=1;
		for(int i=0;i<b;i++){
			tmp *= a;
		}
		return tmp;
	}
	public static int fact(int x){
		int factor = 1;
		for(int i=0;i<x;i++){
			factor *= i + 1;
		}		
		return factor;
	}	
	public static double sin(double x){
		int n = 5;
		double res = 0;		
		for(int i=0; i<n; i++){
			res += (((pow(-1, i)) /
			fact(2*i+1)) *
			pow(x, 2*i+1));			
		}
		return res;
	}	
	public static void main(String[] args) {
		System.out.println(sin(30*3.14/180));
		System.out.printf("%f\n", sin(30*3.14/180));
	}
}