Sum of Digits

You are given a non-negative integer n. Your task is to calculate the sum of its digits. In mathematical terms, if the integer is represented as a sequence of digits \(d_1, d_2, \ldots, d_k\), you are required to compute \(\sum_{i=1}^{k} d_i\). For example, if the input is 1234, the output should be 10 because \(1+2+3+4=10\).

The input will be provided via standard input (stdin) and the result should be printed on standard output (stdout).

inputFormat

The input consists of a single non-negative integer n (0 \leq n). The integer is provided in a single line via standard input.

outputFormat

Output the sum of the digits of the integer n to standard output. The output should be a single integer which is the sum of all decimal digits of n.

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