#include <iostream>
#include <vector>
int main()
{
    int N;
    std::cin >> N;
    std::vector<int> A(N), B(N);
    for (int i = 0; i < N; i++) { std::cin >> A[i] >> B[i]; }
    constexpr int INF = 1 << 30;
    std::vector<std::vector<int>> dp(1 << N, std::vector<int>(N, INF));
    for (int i = 0; i < N; i++) { dp[1 << i][i] = 0; }
    for (int i = 0; i < (1 << N); i++) {
        for (int j = 0; j < N; j++) {
            if ((i & (1 << j)) == 0) { continue; }
            const int p = i - (1 << j);
            if (p == 0) { continue; }
            for (int k = 0; k < N; k++) {
                if (p & (1 << k)) { dp[i][j] = std::min(dp[i][j], std::max(dp[p][k], A[j] - A[k] + B[k])); }
            }
        }
    }
    int ans = INF;
    for (int j = 0; j < N; j++) { ans = std::min(ans, dp[(1 << N) - 1][j]); }
    std::cout << ans << std::endl;
    return 0;
}