#include<stdio.h>
#include<iostream>
#include<string.h>
using namespace std;

struct node
{
int money;
double p;
}bank[105];

int main(void)
{
int i,j,k,n,t,sum;
double m;
double dp[10005];
scanf("%d",&t);
while(t--)
{
sum=0;
memset(dp,0,sizeof(dp));
dp[0]=1;
scanf("%lf%d",&m,&n);
m=1-m;
for(i=0;i<n;i++)
{
scanf("%d%lf",&bank[i].money,&bank[i].p);
bank[i].p=1-bank[i].p;
sum=sum+bank[i].money;
}
for(i=0;i<n;i++)
{
for(j=sum;j>=bank[i].money;j--)
{
dp[j]=max(dp[j],dp[j-bank[i].money]*bank[i].p);
}
}
for(i=sum;i>=0;i--)
{
if(dp[i]-m>=0.000000001)
{
printf("%d\n",i);
break;
}
}
}
return 0;
}