#include
#include
using namespace std;
int power(int a, int n)
{
int ans;
if (n == 0) ans = 1;
else
{
ans = power(a, n / 2);
if(n%2==1) ans *= a;
}
return ans;
}
int main()
{
long long a,b,c,d;
cin>>a>>b>>c>>d;
long long e=power(a,b)*c+d;
if(e%2!=0&&e!=0)
{
cout<<"YES"< }
else{
cout<<"NO"< }
return 0;
}
#include
using namespace std;
int power(int a, int n)
{
int ans;
if (n == 0) ans = 1;
else
{
ans = power(a, n / 2);
if(n%2==1) ans *= a;
}
return ans;
}
int main()
{
long long a,b,c,d;
cin>>a>>b>>c>>d;
long long e=power(a,b)*c+d;
if(e%2!=0&&e!=0)
{
cout<<"YES"<
else{
cout<<"NO"<
return 0;
}
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