# Python | Find sum of frequency of given elements in the list

Given two lists containing integers, the task is to find sum of frequency of element of first list in second list.

Example:

```Input: list1 = [1, 2, 3]
list2 = [2, 1, 2, 1, 3, 5, 2, 3]

Output: 7

Explanation:
No of time 1 occurring in list2 is :2
No of time 2 occurring in list2 is :3
No of time 3 occurring in list2 is :2
Sum = 2+3+2 = 7
```

Below are some ways to achieve the above tasks.

Method #1: Using `sum()`

 `# Python code to find sum of frequency of  ` `# element of first list in second list. ` ` `  `# List initialization ` `Input1 ``=` `[``1``, ``2``, ``3``] ` `Input2 ``=` `[``2``, ``1``, ``2``, ``1``, ``3``, ``5``, ``2``, ``3``] ` ` `  `# Using sum ` `Output ``=` `sum``(Input2.count(elem) ``for` `elem ``in` `Input1) ` ` `  `# Printing output ` `print``(``"Initial list are:"``, Input1, Input2) ` `print``(``"Frequency is:"``, Output) `

Output:

```Initial list are: [1, 2, 3] [2, 1, 2, 1, 3, 5, 2, 3]
Frequency is: 7
```

Method #2: Using `sum()` and `Counter()`

 `from` `collections ``import` `Counter ` ` `  `# List initialization ` `Input1 ``=` `[``1``, ``2``, ``3``] ` `Input2 ``=` `[``2``, ``1``, ``2``, ``1``, ``3``, ``5``, ``2``, ``3``] ` ` `  ` `  `temp ``=` `Counter(Input2) ` `Output ``=` `sum``(temp[x] ``for` `x ``in` `Input1) ` ` `  `# Printing output ` `print``(``"Initial list are:"``, Input1, Input2) ` `print``(``"Frequency is:"``, Output) `

Output:

```Initial list are: [1, 2, 3] [2, 1, 2, 1, 3, 5, 2, 3]
Frequency is: 7
```

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