Submission #1114945

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Source Code Expand

#include <iostream>
#define INF 1e+18
#define int long long
using namespace std;

signed main(){
	int n,m;
	cin >> n >> m;
	if(n * 2 >= m) {
		cout << n << endl;
		return 0;
	}
	if(m % 2 == 1) m--;
	m /= 2;
	cout << (n + m) / 2 << endl;
	return 0;
}

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