// editor1
#include<stdio.h>
#define PI 3.14159265358979323846
double degreeToRadian(double degree) {return degree * (PI / 180.0);}
int main()
{
    double degree, radian;
scanf("%1f", &degree);
radian = degreeToRadian(degree);
printf("%.21f\n", radian);
return 0;
    
}