TASK

Problem

#61

In “Sum of Digits of Three-Digit Number”, given the required decimal number, sum its three digits.

EXAMPLE

Example

Input

123

Output

6

LIMITS

Constraints

The number has exactly the number of decimal digits stated in the task and is non-negative.

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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 Digits of Three-Digit Number”: 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 Digits of Three-Digit Number”, 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 / 100 + (n / 10) % 10 + n % 10 << '\n';
    return 0;
}