This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
ll n,m,k,cnt;
void anomalous_solve()
{
	cin>>n>>k;
	if(k==0)
	{
		if(n%2==0)
		{
			cout<<(n*n)/2;
		}
		else
		{
			cout<<(n*n)/2+1;
		}
	}
}
int main()
{
	//	freopen("INPUT.txt","r",stdin);
	//  freopen("OUTPUT.txt","w",stdout);
	
	ios_base::sync_with_stdio();
    cin.tie(NULL);
    cout.tie(NULL);
    
    ll test=1;
    //cin>>test;
    for(int pos=1;pos<=test;pos++)
    	anomalous_solve();
}
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