Submission #1114936

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Source Code Expand

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <numeric>
#include <map>
#define REP(i,n) for (int i=0;i<(n);i++)
#define ll long long
#define ull unsigned long long
int dx[4] = {1, 0, -1, 0};
int dy[4] = {0, 1, 0, -1};

using namespace std;

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
	ll n,m;
	cin >> n >> m;
	if(n*2>=m){
		cout << m/2 << endl;
	}else{
		cout << n + (m - n*2)/4 << endl;
	}

  return 0;
}

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