TASK

Problem

#65

Given a four-digit non-negative integer `n`, print the sum of its first and last decimal digits.

EXAMPLE

Example

Input

1234

Output

5

LIMITS

Constraints

1000 ≤ n ≤ 9999.

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LEARN Theory for this problem

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Repeated division by powers of 10 and `% 10` isolate decimal digits without converting the number to a string.

Connection to “Sum of First and Last Digits”: here, integer `/` and `%` provide the quotient and remainder, which is useful for digit extraction and cyclic arithmetic.

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NEED HELP? Hints

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['Extract the digits first, then combine or compare them.', 'After solving “Sum of First and Last Digits”, verify the algorithm on your own small example and on an allowed boundary case. Print only the required result with no extra text.']

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ANSWER Solution

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#include <iostream>
#include <algorithm>
using namespace std;
int main() {
    int n;
    cin >> n;
    cout << n / 1000 + n % 10 << '\n';
    return 0;
}