x, y = map(int, input().split())
if y == 0:
print('No')
exit(0)
if y == 1:
if x == 0:
print('Yes')
else:
print('No')
exit(0)
print('Yes' if x >= y - 1 and (x - y + 1) % 2 == 0 else 'No')#include<bits/stdc++.h>
using namespace std;
#define ll long long
int main(){
ll x,y;
cin>>x>>y;
y=y-1;
if (y > x || (x > 0 && y <= 0))
{
cout << "No" ;
return 0;
}
if((x%2==0 && y%2==0)||(x%2==1 && y%2==1))
cout<<"Yes"<<endl;
else
cout<<"No"<<endl;
return 0;
}
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