mod_sum

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

/**
The program:
You must find the sum of the mods of a list of numbers.
Modular arithmetic refers to the remainder of the divide function. A mod B = the remainder of A/B.

For example:
5 mod 2 = 1
15 mod 6 = 3
 **/

using namespace std;

int main()
{
    int M, s;
    cin >> M; cin.ignore();
    int N;
    cin >> N; cin.ignore();
    for (int i = 0; i < N; i++) {
        int E;
        cin >> E; cin.ignore();
        s += E % M;
    } cout<< s;
}