#include<stdio.h>
#include<math.h>
#define M_PI 3.1415926535
double dtr(double d)
{
    return d*(M_PI /180.0);
}
int main()
{
    double d;
    scanf("%1f",&d);
    double r=dtr(d)
    printf("%.2f\n",r);
    return 0;
}