Java: How to sum all numbers in loop?

How do I sum all the numbers that the loop prints out? (x)

public static void main(String [] args) {

for (int i = 0; i < 500; i++) {
        int x = 3*i + 5*i;
        if (x < 1000) {
            System.out.println(x);
        }
    }

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