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

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);  
	int m, n;
	cin >> m >> n;
	cout << setprecision(20) << fixed << m + 1.0 * n / 3 << endl;
	return 0;	
}