// #pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
// #include <x86intrin.h>
using namespace std;
#if __cplusplus >= 202002L
using namespace numbers;
#endif



int main(){
	cin.tie(0)->sync_with_stdio(0);
	cin.exceptions(ios::badbit | ios::failbit);
	auto __solve_tc = [&](auto __tc_num)->int{
		long long th;
		string s;
		cin >> th >> s;
		{
			auto it = ranges::find(s, '.');
			if(it == s.end()){
				s += '.';
				it = prev(s.end());
			}
			s += string(4 - (s.end() - it), '0');
			erase(s, '.');
		}
		int avg = stoi(s) % 1000;
		if(avg == 999){
			avg = 0;
		}
		long long res = 0;
		{ // 0
			int req = 1000 / gcd(avg, 1000);
			res += th / req;
		}
		if(gcd(avg, 1000) == 1){ // 999
			int inv = 1;
			{
				int base = avg;
				for(auto e = 399; e; e >>= 1){
					if(e & 1){
						inv = inv * base % 1000;
					}
					base = base * base % 1000;
				}
			}
			int rem = 999 * inv % 1000;
			if(th >= rem){
				res += 1 + (th - rem) / 1000;
			}
		}
		cout << res << "\n";
		return 0;
	};
	int __tc_cnt;
	cin >> __tc_cnt;
	for(auto __tc_num = 0; __tc_num < __tc_cnt; ++ __tc_num){
		__solve_tc(__tc_num);
	}
	return 0;
}

/*

*/