[백준_JAVA_알고리즘] 24313 알고리즘 수업 - 점근적 표기 1

import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        int a1 = scanner.nextInt();
        int a0 = scanner.nextInt();
        int c = scanner.nextInt();
        int n0 = scanner.nextInt();
        
        if((a1*n0+a0 <= c*n0)&&(a1<=c))
        	System.out.println(1);
        else
        	System.out.println(0);

        scanner.close();
    }
}