#include <stdio.h>
#include <math.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
double degreesToRadians(double degrees) {
    return degrees * (M_PI / 180.0);
}
int main() {
    double degrees;
    scanf("% 1 f", &degrees);
    double radians = degreesToRadians(degrees);
    printf("%.2f\n", radians);
    return 0;
}