#include <bits/stdc++.h>

using namespace std;


typedef int32_t h_int32;
typedef int64_t h_int64;
typedef uint32_t uh_int32;
typedef uint64_t uh_int64;
typedef h_int64 h_int;

#define REP( i, n ) for(int i = 0; i < ( int )( n ); ++i )
#define REPR( i, n ) for(int i = ( int )( n ); i >= 0; --i)
#define FOR( i, a, n ) for(int i = ( int )( a ); i < ( int )( n ); ++i )
#define FORR( i, a, n ) for(int i = ( int )( n ); i >= ( int )( a ); --i)

#define ALL( x ) x.begin(), x.end()

#define DOUT( x ) cerr << #x << " = " << x << "\n"
#define COUT( x ) cout << ( x ) << "\n"

#define INF 999999999

signed main()
{
        ios::sync_with_stdio( false );
        cin.tie( 0 );

        h_int h, w, n, k;
        cin >> h >> w >> n >> k;
        h_int ans = h % n;
        ans *= w % n;
        ans %= n;
        COUT( ( ans == 0 ? n : ans ) == k ? "YES" : "NO" );
        return 0;
}