public static int[] multiplyPoly (int[] arr1) {
	    int[] result = new int[13];
	    for (int i = 0; i < result.length; i++) {
		    result[i] = 0;
	    }
	    for (int i = 0; i < 11; i += 2) {
		    for (int j = 1; j < 12; j += 2) {
                int bin = arr1[i] + arr1[j];
                if (bin > 0 && bin < 13) {
                    result[bin - 1] += 1;
                } else {
            	    result[0] += 1;
                }
		    }		
	    }
	    return result;
    }