// editor1
#include<stdio.h>
#include<math.h>
double degreestoRadians(double degrees){
    return degrees * (M_PI / 180.0);
}
int main(){
    double theta;
    scanf("%lf",&theta);
    double radians = degreestoRadians(theta);
    printf("%.2lf\n",radians);
    return 0;
    
}