// editor1
#include<stdio.h>
#include<math.h>

double degreesToRadians(double degrees)
{
    double radians = degrees * (M_PI / 180.0);
    return radians;
}

int main()
{
    double degrees;
    if(scanf("%lf", &degrees) == 1)
    {
        double radians = degreesToRadians(degrees);
        
        printf("%.2lf\n", radians);
    }
    return 0;
}