#include <bits/stdc++.h>
#define boAshraf ios_base::sync_with_stdio(false); cin.tie(NULL);
#define ll long long
#define sz(s) (int)(s).size()
#define all(s) (s).begin(),(s).end()
using namespace std;
void File();
void sol();
const long double pi = acos(-1);
int main() {
    boAshraf
    File();
    int t = 1;
    cin >> t;
    while (t--) {
        sol();
    }
    return 0;
}

void sol() {
    ll n,m,R;
    cin>>n>>m>>R;
    auto valid=[&](ll mid)->bool{
        long double tot=mid*2*pi*R+(mid)*(mid-1)*pi*m;
        return tot>=n;
    };
    ll l=1,r=1e9,ans=-1;
    while(l<=r){
        ll mid=(l+r)/2;
        if(valid(mid))ans=mid,r=mid-1;
        else l=mid+1;
    }
    cout<<R+(ans-1)*m<<'\n';
}

void File() {
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
}