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#include <bits/stdc++.h>
using namespace std;
const int N = 503;
int dist[N];
vector<pair<int, pair<int, int>>> edges;
int main()
{
ios_base::sync_with_stdio(false);
cin.tie();
int n, m, s;
cin >> n >> m >> s;
for (int i = 0; i <= n; i++)
{
dist[i] = 2e9;
}
dist[s] = 0;
for (int i = 0; i < m; i++)
{
int u, v, w;
cin >> u >> v >> w;
edges.push_back({w, {u, v}});
// edges.push_back({w, {v, u}});
}
for (int i = 0; i < n + 1; i++)
{
for (auto e : edges)
{
int w = e.first;
int u = e.second.first;
int v = e.second.second;
if (dist[v] > dist[u] + w)
{
dist[v] = dist[u] + w;
}
}
}
for (auto e : edges)
{
int w = e.first;
int u = e.second.first;
int v = e.second.second;
if (dist[v] > dist[u] + w)
{
cout << "NIE\n";
return 0;
}
}
for (int i = 0; i < n; i++)
{
if (i != s && dist[i] < 1e9)
cout << i << " " << dist[i] << "\n";
}
}
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