#include<stdio.h>
#define _USE_MATH_DEFINES
#include<math.h>
double degree_to_radian(double thetha){
    return theta*(3.141597/180.0);

}
int main(){
    double thetha;
    scanf("1%f",&theta);
    double redian=degree_to_radian(theta);
    printf("%.21f\n",redians);
    return 0;
}