Submission #1114454

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Source Code Expand

#include <cstdio>
#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <malloc.h>
#include <stack>
#include <cstring>
#include <string>
#include <set>
#include <stack>
#include <unordered_map>
#define INT long long int
#define MOD 1000000007
#define oo 2000000007
using namespace std;

INT n, m, ans;

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

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