Zabastovki.2HEAD.Exe

#include <iostream>
#include <iomanip>
#include <string>
#include <sstream>
#include <algorithm>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <fstream>
#include <stack>
#include <map>
#include <cstring>
#include <cmath>
#include <set>
#include <iterator>
#include <cmath>

using namespace std;




int main()
{
    int N, K;
    cin >> N >> K;
    int a, b, i;
    set<int> s;
    for (i = 0; i < K; ++i)
    {
        cin >> a >> b;
        for (auto j = a; j <= N; j += b)
        {
            if (j % 7 != 0 & (j + 1) % 7 != 0)
                s.insert(j);
        }
    }
    cout << s.size();
    return 0;
}