This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using i64 = long long;
constexpr int N = 305;
int n, m;
int main(){
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    std::cin >> n >> m;
    std::vector<int> a(m);
    for (int i = 0, x; i < m; i++) {
        std::cin >> x >> a[i];
    }
    sort(a.begin(), a.end());
    i64 ans = 0;
    for (int i = 0; i < m; i++) {
        ans += abs(a[i] - a[m / 2]);
    }
    std::cout << ans << "\n";
    return 0;
}
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