#include<stdio.h>
double angle_in_radian(int n)
{
    double radian = 0;
    radian = n * (3.14/180);
    return radian;
    
}
int main()
{
    double n;
    scanf("%lf",&n);
    printf("%.2lf",angle_in_radian(int n));
    return 0;
}