Submission #1114537

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Source Code Expand

#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
using namespace std;

#define int long long
int N, M;

signed main() {
  cin >> N >> M;
  int s = min(N, M/2);
  N -= s;
  M -= 2*s;
  if (N == 0 && M > 0) {
    s += M/4;
  }
  cout << s << "\n";
  return 0;
}

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