#include <iostream>
#include <vector>
#include <limits.h>

using namespace std;

vector<int> P, W;
int n;
int E, F;
vector<int> MAX, MIN;

bool input()
{
    cin >> E >> F;
    if (1 > E || E > 10000 || F < E || 1 > F || F > 10000)
    {
        cout << "This is impossible.";
        return false;
    }
    cin >> n;
    if (1 > n || n > 500)
    {
        cout << "This is impossible.";
        return false;
    }
    MAX = vector<int>(F - E + 1, INT_MIN);
    MIN = vector<int>(F - E + 1, INT_MAX);
    P.resize(n); W.resize(n);
    for (int i = 0; i < n; i++)
    {
        cin >> P[i] >> W[i];
        if (1 > P[i] || P[i] > 50000 || 1 > W[i] || W[i] > 10000 || P[i] * W[i] > F)
        {
            cout << "This is impossible.";
            return false;
        }
    }
}

void solve()
{
    MIN[0] = 0;
    MAX[0] = 0;
    for (int i = 0; i < MIN.size(); i++)
    {
        for (int j = 0; j < W.size(); j++)
        {
            if (i - W[j] >= 0 && MIN[i - W[j]] != INT_MAX)
            {
                MIN[i] = min(MIN[i], MIN[i - W[j]] + P[j]);
                MAX[i] = max(MAX[i], MAX[i - W[j]] + P[j]);
            }
        }
    }

}

void output()
{
    if (MIN.back() == INT_MAX)
        cout << "This is impossible.";
    else
        cout << MIN.back() << ' ' << MAX.back();
}

int main()
{
    if (input() == false) return 0;
    solve();
    output();

    return 0;
}