#include<stdio.h>
#define _USE_MATH_DEFINES
#include<math.h>
double degree_to_radian(double theta){
    return theta*(3.141597/180.0);
}
int main(){
    double theta;
    scanf("%lf",&theta);
    double redians=degree_to_radian(theta);
    printf("%.2lf\n",radians);
    return 0;
}