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#include <bits/stdc++.h> using namespace std; double Fpow(double x , int n) { double res = 1; while(n > 0) { if(n & 1) res *= x; x *= x; n >>= 1; } return res; } double x = 5.0 / 0.85786438; // radius decrease in constant value x void solve() { cout << fixed << setprecision(8); double R; int n; cin >> R >> n; cout << R / Fpow(x , n) << '\n'; } int32_t main() { std::ios::sync_with_stdio(false); ios_base::sync_with_stdio(false); cout.tie(nullptr); cin.tie(nullptr); int t = 1; cin >> t; while (t--)solve(); }
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