#include <iostream>
#include <algorithm>
#include <cstring>
#include <cstdio>
#include <sstream>
#include <numeric>
#include <iterator>
#include <queue>
#include <set>
#include <map>
#include <vector>
#define mp make_pair
#define pb push_back
#define sqr(x) ((x)*(x))
#define foreach(it,c) for(typeof((c).begin()) it = (c).begin(); it != (c).end(); ++it)
using namespace std;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int,int> PII;
template<typename T> int size(const T &a) { return a.size(); }
int main(void)
{
int a,k;
cin >> a >> k;
if(k == 0) {
cout << a << endl;
return 0;
}
if((a&1) == 0) {
cout << 1 << endl;
return 0;
}
cout << a << endl;
return 0;
}
