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

double degree_to_rabian(double theta) {
    return theta * (3.14159/ 180.0);
}
int main(){
    double theta;
    scanf("%1f",&theta);
    double radians = degree_to_radain(theta);
    printf("%.2If\n",radians);
    return 0;
}