/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main(String[] args) {
    long sum = 2;
    long isPrime;
    for(long x = 3; x < 2000000; x+=2){//x is the number we check for if it is a prime
        isPrime = 0;
        long y = 3;
        while(isPrime == 0) {
            if(x%y==0){
                isPrime = 1;
            }
            if(y*y > x) {
                isPrime = 1;
                sum+=x;
            }
            y += 2;
        }
    }
    System.out.println(sum);
}
}

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