Submission #1789352

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Source Code Expand

#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <utility> //pairを使う
using namespace std;

typedef unsigned long long ll;

const ll inf = 1000000000000;
const ll mod = 100000;

int main(){
	ll n, m, t = 0;
	cin >> n >> m;
	if(m >= n * 2){
		t += n;
		t += (m - n * 2) / 4;
	}else{
		t += m / 2;
	}
	cout << t << endl;
	return 0;
}

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