#include<stdio.h>
main()
{
	int n,i,num;
	float len,D,d,s;
	scanf("%d",&n);
	for(i=0;i<n;i++)
	{
		scanf("%f%f%f",&D,&d,&s);
		len=3.1415926*(D-d);
		num=(int)(len/(s+d));
		printf("%d\n",num);
	}
	
}