#include (stvoid degrees_to_randian(float degree);
void degrees_to_randian(float degree)
{
    float PI=3.141592;
    float radian=(degree*(PI/180));
    printf("%.2f",radian);
}
int main()
{
    float b;
    scanf("%f",&b);
    degrees_to_randian(b);
    return 0;
}