#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define M_PI 3.14159265358979323846

long long Fact(int X);
int main()
{
    double X;
    int n;
    scanf("%lf %d", &X, &n);
    if (X<=360 && X>=0 &&n<=9 &&n>=0){
    X=(X*M_PI)/180;
    double sine=X;
    int i=1;
    while (n){
        sine+=pow(-1,i)*pow(X,(2*i+1))/Fact(2*i+1);
        i++;
        n--;
    }
    printf("calculated %.10lf expected %.10lf\n", sine, sin(X));
    }
    return 0;
}
long long Fact(int X){
    int i;
    long long fact=1;
    for ( i=1 ; i<=X ; i++){
        fact*=i;
    }
    return  fact;
}