#include<stdio.h>
#define pi 3.14

float deg_to_red(float deg)

{
    return(deg*pi/180);
}
int main()

{
    float red,deg;
    scanf("%f",&deg);
    
    red=deg_to_red(deg);
    
    printf("%2f",&red);
    
    places;
    return 0;
}