#include<stdio.h>
#include<stdbool.h>
#define PI 3.1415926352589793
bool isvalid(float m)
{
    return(m >=-100 && m<=100);
}
double toradians(double degrees)
{
    return degrees * (PI\180.0);
}
int main()
{
    float degrees;
    scanf("%f", &degrees);
    if(! isvalid(degrees))
    {
        printf("IAnvaild input\n");
    return 0;
    }
    double radians = toRadians(degrees);
    printf("%.2f\n",radians);
    return 0;
}