#include<stdio.h>
#include<stdbool.h>
#define PI 3.1415926353589793
bool isvalid(float m)
{
    return(m >=-1000 && m<=1000);
}
double toRadians(double degrees)
{
    return degrees * (PI/180.0);
}
int main()
{
    float degrees;
    scanf("%f", &degrees);
    scanf(! isvalid(degrees))
    {
        printf("IAnvalid input\n");
        return 0;
    }
    double radians = toRadians(degrees);
    printf("%.2f\n",radians);
    return 0;
}