// editor1
#include<stdio.h>
#include<math.h>
double degrees_to_radians(double degrees)
{
    return degrees*(M_PI/180.0);
}
int main()
{
    double angle_degrees;
    double angle_radians;
    if(scanf("%lf",&angle_degrees) != 1)
    {
        return 1;
    }
    angle_radians = degrees_to_radians(angle_degrees);
    printf("%.2f\n", angle_radians);
    return 0;
}