public class Timing {
    public static void main(String[] args) {
        long startTime = System.currentTimeMillis();
        
        double a = 1.0;
        double b = 0.0;
        for(int i = 0; i < 100000000; i++) {
            a *= Math.cos(Math.sqrt((double) i));
            if(a % 2.0 < 1.0) {
                b += Math.pow(a, -0.8);
            } else {
                b -= Math.pow(a, -0.8);
            }
        }
        
        long endTime = System.currentTimeMillis();
        
        System.out.printf("Start time was %d.\n", startTime);
        System.out.printf("End time was %d.\n", endTime);
        System.out.printf("That took %d ms.\n", endTime - startTime);
    }
}