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Se queres inserir varios valores, em vez de os inserir em variaveis é melhor guardalos numa coleçao, porque se nao vais ter sempre um limite de variaveis às que atribuir valores. E para a comprovaçao tenta isto:

ArrayList<Integer> numeros = new ArrayList<Integer>();

int numero = in.nextInt();

while(numero != -1)
     numero = in.nextInt();
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