#include<iostream>
#include<cmath>
using namespace std;
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typedef struct node
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{
int p;
int w;
}Node;
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Node a[10001];
int dp[20001];
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int main()
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{
int text;
cin>>text;
while(text--)
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{
int e,f;
cin>>e>>f;
int c = f-e;
int n,ps,ws;
int i,j;
int k = 1;
int h = 2;
cin>>n;
for(i = 1;i <= n;i++)
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{
cin>>ps>>ws;
a[k].p = ps;
a[k].w = ws;
while(1)
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{
k++;
if(a[k-1].p*2 > c)
break;
else
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{
a[k].p = a[k-1].p * 2;
a[k].w = a[k-1].w * 2;
}
}
}
for(i = 0;i <= c;i++)
dp[i] = 1000000;
dp[0] = 0;//
for(i = 1;i < k;i++)
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{
for(j = a[i].w ;j <= c;j++)
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{
if(dp[j] > dp[j-a[i].w] + a[i].p)
dp[j] = dp[j-a[i].w] + a[i].p;
}
}
if(dp[c] == 1000000)
cout<<"This is impossible."<<endl;
else
cout<<"The minimum amount of money in the piggy-bank is "<<dp[c]<<"."<<endl;
}
return 0;
}
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