#include<iostream>
#include<algorithm>
#include<vector>
#include<string>
#include<utility>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<functional>
#include<math.h>
#include<random>
#include <bitset>
using namespace std;
#define N (1000000000+7)
//#define N 998244353
#define INF 1e16
typedef long long ll;
typedef pair<int,int> P;
typedef pair<int,P> Q;

const int inf = (int)1e9; 

ll gcd(ll a, ll b) {
	if (b > a) {
		ll tmp = b;
		b = a;
		a = tmp;
	}
	if (a%b == 0)return b;
	else return gcd(b, a%b);
}

ll inv(ll x,ll power) {
	ll res = 1;
	ll k = power;
	ll y = x%N;
	while (k) {
		if (k & 1)res = (res*y) % N;
		y = (y%N*y%N) % N;
		k /= 2;
	}
	return res;
}

ll c[200010];

int main(void){
	int a,b;
	cin>>a>>b;
	int s = a+b;
	int ans = 0;
	for(int i=a;i<=b;i++){
		if((s+i)%3==0)ans++;
	}
	cout<<ans<<endl;
	return 0;
}