Submission #1137444

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Source Code Expand

#include <cstdio>
#include <cstring>
#include <string>
#include <cmath>
#include <cassert>
#include <iostream>
#include <algorithm>
#include <stack>
#include <numeric>
#include <queue>
#include <vector>
#include <set>
#include <map>
#include <bitset>
#include <functional>

using namespace std;
typedef long long ll;
#define pl pair<ll,ll>
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define rep(i,n) for(int i=0;i<(n);++i)
#define foreach(itr,c) for(__typeof(c.begin()) itr=c.begin(); itr!=c.end(); itr++)
#define dbg(x) cout << #x"="<< (x) << endl
#define mp(a,b) make_pair((a),(b))
#define pb(a) push_back(a) 
#define in(x) cin >> x;
#define all(x) (x).begin(), (x).end()
#define INF 2147483600
#define fi first
#define se second



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

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