最近入坑了C++，80pts求改

#include<bits/stdc++.h>
using namespace std;
class cls{
	public:
		int func(int a,int b){
//			cout<<a<<" "<<b<<endl;
			if(a%2==1){
				a--;
				b++;
			}
			if(a==0)return b;
			else if(b==0)return a;
			return func(a/2,b)+a/2;
		}
}c;
int a,b;
int main(){
	cin>>a>>b;
	cout<<c.func(a,b);
	return 0;
}