import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class mortgage{

public static void main(String[] args) throws IOException{

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

while(true){
String s = br.readLine();
	if(s.equals("0 0 0 0")){
	break;
	}

int x=0;
int y=0;
int n=0;
float r=0.00f;

StringTokenizer st= new StringTokenizer(s," ");
x = Integer.parseInt(st.nextToken());
y = Integer.parseInt(st.nextToken());
n = Integer.parseInt(st.nextToken());
r = Float.parseFloat(st.nextToken());

if(algorithm(x,y,n,r)){
System.out.println("YES");
} else {
System.out.println("NO");
}

}
} 

public static boolean algorithm(int x, int y, int n, float r){

float pom = (r/12)/100;
if(x>(y*n*12)){
return false;
}

if(y<(pom*x)){
return false;
}



for(int i=0; i<n*12;i++){
x = (int)(x + (x * (pom))) - y;


} 
if(x<=0){
return true;
}

return false;

} 

}