public class output
    {
        public static void main(String args[]) 
        {
            int p[] = {5,6,7,8,9};
	    int q[] = p;
	    int sum = 0;
	    for (int j = 0; j < 4; ++j)
                sum += (p[j] * q[j + 1]) + (p[j + 1] * q[j]);
	    System.out.println(sum);
        } 
    }