#include using namespace std; typedef long long int ll; typedef pair P; typedef vector VI; typedef vector VVI; #define REP(i,n) for(ll i=0;i<(n);i++) #define ALL(v) v.begin(),v.end() template bool chmax(T &x, const T &y) {return (x bool chmin(T &x, const T &y) {return (x>y)?(x=y,true):false;}; constexpr ll MOD=998244353; constexpr ll INF=2e18; int main(){ ll x, a, y, b; cin >> x >> a >> y >> b; if(y==1){ cout << "Yes" << endl; return 0; } if(x==1){ if(y==1) cout << "Yes" << endl; else cout << "No" << endl; return 0; } ll cnt=0; if(x%y==0){ while(x%y==0){ x/=y; cnt++; } if(a*cnt>=b) cout << "Yes" << endl; else cout << "No" << endl; } else if(y%x==0){ while(y%x==0){ y/=x; cnt++; } if(a>=b*cnt&&y==1) cout << "Yes" << endl; else cout << "No" << endl; } else cout << "No" << endl; }