#include <bits/stdc++.h>
using namespace std;
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
int T, n;
cin >> T >> n;
if (T == 1) {
long long ans = 0;
vector<int> a;
for (int i = 0; i < n; i++) {
char x, y;
int c, d;
cin >> x >> c >> y >> d;
if (x == y) ans += abs(c - d);
else a.push_back(c), a.push_back(d), ans++;
}
sort(a.begin(), a.end());
for (int i : a) {
ans += abs(i - a[a.size() / 2]);
}
cout << ans << '\n';
}
else {
}
return 0;
}
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