hdu1114

#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <string>
#include <cstdlib>
#define Maxn 0xfffffff

using namespace std;

int cmp(int x,int y){
    return x < y?x:y;
}

//int dp[1100][1100];
int v[11000];
int w[11000];
int dp[11000];

int main()
{
  //  freopen("input.txt","r",stdin);
    int t;
    cin >> t;
    while(t--){
        int M;
        int V,n;
        cin >> M >> V;
        V -= M;
        cin >> n;
        for(int i = 1;i <= n;i++){
            cin >> v[i] >> w[i];
        }
        for(int i = 0;i <= V;i++)
            dp[i] = Maxn;
        dp[0] = 0;
        for(int i = 1;i <= n;i++){
            for(int j = w[i];j <= V;j++){
                dp[j] = cmp(dp[j],dp[j-w[i]]+v[i]);
            }
        }
        if(dp[V] == Maxn)
            cout << "This is impossible." << endl;
        else
            cout << "The minimum amount of money in the piggy-bank is " <<dp[V] <<"."<< endl;
    }
    return 0;
}