#include <vector> 
#include <list> 
#include <map> 
#include <set> 
#include <deque> 
#include <queue> 
#include <stack> 
#include <bitset> 
#include <algorithm> 
#include <functional> 
#include <numeric> 
#include <utility> 
#include <sstream> 
#include <iostream> 
#include <iomanip> 
#include <cstdio> 
#include <cmath> 
#include <cstdlib> 
#include <cctype> 
#include <string> 
#include <cstring> 
#include <ctime> 

using namespace std;

#define _int64 long long

int main()
{
  int n,k,tmp,sum,rem,b1,i;
  while (scanf("%d%d",&n,&k)!=EOF)
  {
    sum=(k*(k-1)/2);
　　//假设这个序列是从1到k-1的
　　//此处记录1到k-1的和
    b1=0;
　　//flag
    for (i=1;i*i<n;i++)
    {
      rem=n-i*i;
      tmp=i*i;
      if (tmp<sum) continue;
      if ((rem<=k-1)&&(tmp-sum<k-rem)) continue;
      //if ((tmp==sum)&&(rem<=k-1)) continue;
      if ((tmp==sum+1)&&(rem==k)) continue;
      b1=1;
      //cout<<i<<endl;
      break;
    }
    if (b1==1) printf("YES\n");
    else printf("NO\n");
  }
  return 0;
}