#include<stdio.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
int main()
{
    float degrees;
    if(scanf("%f", &degrees) !=1)
    {
        return 1;
    }
    float radius = degrees * (M_PI / 180.0);
    printf("%.2f\n", radians);
    return 0;
}