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