java///////////////////////////////////////////////////////////////
import java.util.Date;
public class T {
public T() {
}
public static void main(String[] args) {
T t = new T();
Date d1, d2;
d1 = new Date();
int x = 0;
double sum = 0;
double mm = 1000000000;
int g = (int) Math.sqrt(mm) + 1;
int i, ii;
boolean b = true;
for (i = 2; i <= mm; i++) {
b = true;
for (ii = 2; ii < g; ii++) {
if (i % ii == 0) {
b = false;
sum++;
break;
}