class Solution {

public:

    /*

     * @param a: The first integer

     * @param b: The second integer

     * @return: The sum of a and b

     */

    int aplusb(int a, int b) {

        // write your code here, try to do it without arithmetic operators.

        if(a==0)

         return b;

        if(b==0)

         return a;

         int _a=a^b;

         int _b=(a&b)<<1;

         return aplusb(_a,_b);

    }

};