Duplicate local variable y ???? ?怎么解決？

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

double x = scanner.nextDouble();

double y = scanner.nextDouble();

double z = scanner.nextDouble();

scanner.close();

? ? for(double x = 1; x <= 100/5; x++){ ? ?

? ?for(double y = 0; y <= 33; y++){

? ?z = 100 - x - y;

? if(5*x + 3*y + z/3 == 100 && z%3 == 0){

? System.out.println("可買(mǎi)雞翁只數(shù): " + x);

? System.out.println("可買(mǎi)雞母只數(shù): " + y);

? System.out.println("可買(mǎi)雞雛只數(shù): " + z);

? System.out.println();

}

}

}

}

}