#include<stdio.h>
#define _USE_MATH_DEFINES
#include<math.h>

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