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            Scanner sc = new Scanner(System.in);
            String nums=sc.nextLine();
            String[] numbers=nums.split(" ");
            int x=Integer.parseInt(numbers[0]);
            int f=Integer.parseInt(numbers[1]);
            int d=Integer.parseInt(numbers[2]);
            int p=Integer.parseInt(numbers[3]);
            int i,j;
            int count=0;
            int temp=0;
            if(x*f<d){
                temp=d-x*f;
                count+=f;
                count+=temp/(x+p);
            }
            else{
                count+=d/x;
            }
            System.out.println(count);