public static int equalStacks(List<int> h1, List<int> h2, List<int> h3)
    {
        Stack<int> stack1 = new Stack<int>(h1);
        Stack<int> stack2 = new Stack<int>(h2);
        Stack<int> stack3 = new Stack<int>(h3);
        
        // Counter
        int c1 = 0;
        int c2 = 0;
        int c3 = 0;
        
        // Sum of each stack
        int sum1 = stack1.Sum();
        int sum2 = stack2.Sum();
        int sum3 = stack3.Sum();
        
        while(sum1 != sum2 || sum2 != sum3 || sum3 != sum1){
            
            if (sum1 >= sum2 && sum1 >= sum3) {
                sum1 -= h1[c1];
                c1++;
            }
            
            else if (sum2 >= sum1 && sum2 >= sum3) {
                sum2 -= h2[c2];
                c2++;
            }
            else if (sum3 >= sum1 && sum3 >= sum2) {
                sum3 -= h3[c3];
                c3++;
            }
        }
        
        return sum1;
    }