public class Balistic {
     public static void main (String[] args) {

        double x0 = Double.parseDouble(args[0]);
        double v0 = Double.parseDouble(args[1]);
        double t = Double.parseDouble(args[2]);

        double g = 9.78033;

        double x = (x0 + v0 * t - (g*(t*t))/2);

        System.out.println(x);
     }
}