import java.util.*;
//codejam 2018 practice round Question C:Speed 2
class Horse{
public static void main(String args[])
{
Scanner sc=new Scanner(System.in);
int t=0;
while(sc.hasNextInt()) {
t=sc.nextInt();
break;
}
double ans[]=new double[t];
int q;
for(q=0;q<t;q++){
int d=0,nh=0;
while(sc.hasNextInt()) {
d=sc.nextInt();
nh=sc.nextInt();
break;
}
double max_time=0.0;
for(int i=0;i<nh;i++){
int td=sc.nextInt();
int ts=sc.nextInt();
int tt=(d-td)/ts;
if(tt>max_time){max_time=tt;}
}
double num_ans=d/max_time;
ans[q]=(double)Math.round(num_ans*1000000)/1000000;
}
for(q=0;q<t;q++){
int e=q+1;
System.out.println("Case #"+e+": "+ans[q]);
}
}
}
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