hd_Hot girl with cool car

#include    <cmath>
#include    <stdlib.h>
#include    <iostream>
using namespace std;
const double PI = acos(-1.0);
    int
main ( int argc, char *argv[] )
{
    double r,w,sita;
    while(cin>>r>>w>>sita) {
        double tmp = cos((double)(sita/360*PI));
        //cout<<(r+w-r*tmp)/(1-tmp)<<endl;
        printf("%.3lf/n",(r+w-r*tmp)/(1-tmp));
    }
    return EXIT_SUCCESS;
}                /* ----------  end of function main  ---------- */