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

int main() {
    ios::sync_with_stdio(false); cin.tie(nullptr);
    int N, M, S; cin >> N >> M >> S;
    vector<vector<int>> g(N+1), rev(N+1);
    vector<int> deg(N+1, 0);
    for (int i = 0; i < M; i++) {
        int u, v; cin >> u >> v;
        g[u].push_back(v);
        rev[v].push_back(u);
        deg[u]++;
    }
    vector<int> grundy(N+1, 0);
    queue<int> q;
    vector<bool> vis(N+1, false);
    for (int i = 1; i <= N; i++) if (deg[i] == 0) { q.push(i); vis[i] = true; }
    while (!q.empty()) {
        int u = q.front(); q.pop();
        set<int> seen;
        for (int v : g[u]) seen.insert(grundy[v]);
        int mex = 0;
        while (seen.count(mex)) mex++;
        grundy[u] = mex;
        for (int p : rev[u]) {
            if (!vis[p]) { vis[p] = true; q.push(p); }
        }
    }
    cout << (grundy[S] ? "First" : "Second") << endl;
    return 0;
}