Cadeado.cpp

#include <bits/stdc++.h>
using namespace std;

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int n; cin >> n;

	int resp = 0;

	for(int i = 1; i <= n; i++)
	{
		int c, s; cin >> c >> s;

		int horario = (c > s ? c - s : s - c);
		int antihorario = (c > s ? 10 + s - c : 10 + c - s);

		resp += min(horario, antihorario);
	}

	cout << resp << '\n';
}