#include<bits/stdc++.h>
using namespace std;
#define int long long

signed main(){
	int a,b;
	cin>>a>>b;
	int l=-1e9,r=1e9;
	while(l+1<r){
		int mid=(l+r)/2;
		if(mid<(a+b))l=mid;
		else r=mid;
	} 
	cout<<r;
	return 0;
}