/*#include <iostream>
#include <cmath>
#include <vector>
#include <algorithm>
#include <array>
#include <vector>
#include <deque>
#include <set>
#include <map>
#include <string>
#include <stack>
#include <queue>
#include <unordered_map>
#include <unordered_set>
*/

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define FOR(i,a,b) for(int (i)=(a);(i)<(b);(i)++)
#define REP(i,n) FOR(i,0,n)
#define ALL(a) (a).begin(),(a).end()
#define RALL(a) (a).rbegin(),(a).rend()
#define SORT(c) sort((c).begin(),(c).end())

typedef long long ll;
const ll INF = 1e15+7;
const ll mod = 1e9 + 7;
const int MAX_N = 1e5 + 5;
int dx[] = { -1LL,0,1LL,0 }, dy[] = { 0,1LL,0,-1LL };
vector<ll> prime;

ll inv[MAX_N], fac[MAX_N];

template <class T = ll> T in() { T x; cin >> x; return (x); }
inline ll GCD(ll a, ll b) { ll c; while (b != 0) { c = a % b; a = b; b = c; }return a; }
inline ll LCM(ll a, ll b) { return a * b / GCD(a, b); }
inline ll POW(ll a, ll b) { ll c = 1LL; while (b > 0) { if (b & 1LL) { c = a * c%mod; }a = a * a%mod; b >>= 1LL; }return c; }
inline void _nCr() { fac[0] = 1LL; for (int i = 1LL; i < MAX_N; i++) { fac[i] = fac[i - 1LL] * i%mod; }for (int i = 0; i < MAX_N; i++) { inv[i] = POW(fac[i], mod - 2); } }
inline ll nCr(ll n, ll r) { return (fac[n] * inv[r] % mod)*inv[n - r] % mod; }
inline void PRI(ll n) { bool a[n + 1LL]; for (int i = 0; i < n + 1LL; i++) { a[i] = 1LL; }for (int i = 2; i < n + 1LL; i++) { if (a[i]) { prime.pb(i); ll b = i; while (b <= n) { a[b] = 0; b += i; } } } }

vector<vector<int>> kake(vector<vector<int>> &tim1,vector<vector<int>> &tim2) {
	vector<vector<int>> res = vector<vector<int>>(tim1.size(),vector<int>(tim1[0].size(),0));
	REP (i,tim1.size()) {
		REP (j,tim1[0].size()) {
			REP (k,tim2[0].size()) {
				res[i][k] += tim1[i][j] * tim2[j][k];
				res[i][k] %= mod;
			}
		}
	}
	return res;
}

class UnionFind {
private:
	vector<int> par;
public:
	UnionFind(int N) { par = vector<int>(N, -1LL); }
	int find(int x);
	ll size(int x);
	void unite(int x, int y);
	bool same(int x, int y);
};



//----UnionFind-------------------------------
int UnionFind::find(int x) {
	if (par[x] < 0) return x;
	else return par[x] = find(par[x]);
}

ll UnionFind::size(int x) {
	return -par[find(x)];
}

void UnionFind::unite(int x, int y) {
	x = find(x);
	y = find(y);

	//大きい方に小さい方をくっ付ける
	if (size(x) < size(y)) swap(x, y);
	par[x] += par[y];
	par[y] = x;
}

bool UnionFind::same(int x, int y) {
	x = find(x);
	y = find(y);
	return x == y;
}

signed main() {
	int n;
	cin >> n;
	int len[n];
	vector<vector<int>> A;
	REP (i,n) {
		len[i] = INF;
		A.push_back(vector<int>());
	}
	len[0] = 0;

	REP (i,n-1) {
		int a,b;
		cin >> a >> b;
		A[a-1].push_back(b-1);
		A[b-1].push_back(a-1);
	}

	queue<int> q;
	q.push(0);
	while (!q.empty()) {
		int x = q.front();
		q.pop();
		REP (i,A[x].size()) {
			if (len[A[x][i]] == INF) {
				len[A[x][i]] = len[x] + 1;
				q.push(A[x][i]);
			}
		}
	}

	int start;
	int mi = -INF;
	REP (i,n) {
		if (mi < len[i]) {
			start = i;
			mi = len[i];
		}
	}
	REP (i,n) {
		len[i] = INF;
	}
	len[start] = 0;
	q.push(start);
	while (!q.empty()) {
		int x = q.front();
		q.pop();
		REP (i,A[x].size()) {
			if (len[A[x][i]] == INF) {
				len[A[x][i]] = len[x] + 1;
				q.push(A[x][i]);
			}
		}
	}

	REP (i,n) {
	}

	sort(len,len+n);
	int ma = len[n-1];
	if ((ma - 1) % 3 == 0) {
		cout << "Second" << endl;
	} else {
		cout << "First" << endl;
	}
}


Measured memory_bytes: 16748