#include <bits/stdc++.h>

using namespace std;
ifstream f("dfs.in");
ofstream g("dfs.out");
const int N = 100010;
int n,m,x,y,s,d[N];
vector<int> v[N];
queue<int> q;
int main()
{
    f>>n>>m>>s;
    for(;m; m--)
    {
        f>>x>>y;
        v[x].push_back(y);
    }
    q.push(s);
    d[s]=1;
    while(q.size())
    {
        x=q.front();
        q.pop();
        for(auto it:v[x])
            if(!d[it])
        {
            d[it]=d[x]+1;
            q.push(it);
        }
    }
    return 0;
}
void dfs(int nod)
{
    viz[nod]=1;
    for(auto vec:v[nod])
        if(!viz[vec])
            dfs(vec);
}