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