Пользователь вводит 5 любых чисел. Найти их сумму

<xml xmlns="http://www.w3.org/1999/xhtml">
<block type="variables_set" x="63" y="63">
<field name="VAR">Сумма</field>
<value name="VALUE">
<block type="math_number">
<field name="NUM">0</field>
</block>
</value>
<next>
<block type="controls_for">
<field name="VAR">i</field>
<value name="FROM">
<block type="math_number">
<field name="NUM">1</field>
</block>
</value>
<value name="TO">
<block type="math_number">
<field name="NUM">5</field>
</block>
</value>
<value name="BY">
<block type="math_number">
<field name="NUM">1</field>
</block>
</value>
<statement name="DO">
<block type="variables_set">
<field name="VAR">Число пользователя</field>
<value name="VALUE">
<block type="text_prompt_ext">
<mutation type="NUMBER"></mutation>
<field name="TYPE">NUMBER</field>
<value name="TEXT">
<block type="text">
<field name="TEXT">Введите число</field>
</block>
</value>
</block>
</value>
<next>
<block type="variables_set">
<field name="VAR">Сумма</field>
<value name="VALUE">
<block type="math_arithmetic">
<field name="OP">ADD</field>
<value name="A">
<block type="variables_get">
<field name="VAR">Сумма</field>
</block>
</value>
<value name="B">
<block type="variables_get">
<field name="VAR">Число пользователя</field>
</block>
</value>
</block>
</value>
</block>
</next>
</block>
</statement>
<next>
<block type="text_print">
<value name="TEXT">
<block type="variables_get">
<field name="VAR">Сумма</field>
</block>
</value>
</block>
</next>
</block>
</next>
</block>
</xml>