package hello;

public class sum{   
	
    public static void main(String[] args){
    	int a = 0;
        int N = 3;
        for(int i=0; i<N; i ++ ) {
        int[] array = new int[i];
        array[i] = i+1;
        a += array[i];
    }
    System.out.println(a);
}
}