#include<stdio.h>
#define_USE_MATH_DEFINES
#include<math.h>

double degree_to_radian(double theta){
    return theta * (3.14156/ 180.0);
}
int main(){
    double theta;
    scanf("%1f", &theta);
    double radians = degree_to_radian(theta);
    printf("%.2lf\n", radians);
    return 0;
}