public class q1multiplesof3and5 {

    public static void main(String args[]) {
        int sum = 0;
        for(int i = 0; i < 1000; i++){
            if(i%3 == 0 || i%5 == 0){
                sum+= i;
            }
        }
        System.out.println(sum);
    }
}