#include<stdio.h>
double degtorad(double deg){
    const double pi=3.141592653589793;
    return deg*pi/180.0;
}
int main(){
    double degrees, radians;
    if(scanf("%1f",&degrees)!=1){
        return 0;
    }
    radians=degtorad(degrees);
    printf("%.2f",radians);
    return 0;
}