#include<iostream>
#include<cstdio>
using namespace std;
int n;
long long x,a,b;
int main()
{
	scanf("%d",&n);
	for(int i=1;i<=n;i++)
	{
		scanf("%lld%lld%lld",&x,&a,&b);
		while((x*a-b<x)&&x>=0)
			x=x*a-b;
		printf("%lld\n",x);
	}
	return 0;
}