本人太弱不会a+b，只能冲一发退火来碰碰运气

#include<bits/stdc++.h> 
#define ll long long
using namespace std;
const double d=0.999;
const double lim=1e-10;
ll a,b;
ll ans;
ll num;
int read()
{
	int x=0,f=1;
	char ch=getchar();
	while(ch<'0'||ch>'9')
	{
		if(ch=='-') f=-1;
		ch=getchar();
	}
	while(ch>='0'&&ch<='9')
	{
		x=x*10+(ch^48);
		ch=getchar();
	}
	return x*f;
}
int calc(int x)
{
    return abs(a+b-x)-abs(a+b-ans);
}
void ghost_fire()
{
    double T=1000000;
    while(T>lim)
    {
        int x=num+((rand()<<1)-RAND_MAX)*T;
        int del=calc(x);
        if(del<0)
        {
            ans=x;
            num=x;
        }
        else if(exp(-del/T)>(double)rand()/RAND_MAX) num=x;
        T*=d;
    }
}
void work()
{
	for(int i=1;i<=100;i++) ghost_fire();
}
int main()
{
    a=read();
    b=read();
    work();
    cout<<ans<<endl;
    return 0;
}