#include "garden.h"
#include "gardenlib.h"
#include <bits/stdc++.h>
using namespace std;
const int maxN=150100;
struct edge{int v,nxt,pa;}a[maxN];
int k,p,m,tmp=0,ans=0,head[maxN],vis[maxN];
void add(int u,int v,int pa){
a[tmp].pa=tmp+pa;a[tmp].v=v;a[tmp].nxt=head[u];head[u]=tmp++;
// printf("Edge#%d u=%d v=%d PairEdge#%d\n",tmp-1,u,a[tmp-1].v,a[tmp-1].pa);
}
void dfs(int u,int ed,int in){
int P;
if (in!=-1){
P=a[in].pa;
vis[in]=1;
vis[P]=1;
// printf("from:%d to:%d Edge#%d vis_edge:%d\n",a[P].v,u,in,ed);
}
if(ed==k){
if (u==p)ans++;
return;
}
int need_back=1;
for (int i=head[u];i!=-1;i=a[i].nxt){
if (i==P)continue;
dfs(a[i].v,ed+1,i);
need_back=0;
return;
}
if (need_back)dfs(a[P].v,ed+1,P);
}
void count_routes(int N, int M, int P, int R[][2], int Q, int G[]){
k=G[0];p=P;m=M;
for (int i=0;i<N;i++)head[i]=-1;
for (int i=M-1;i>=0;i--){
add(R[i][0],R[i][1],1);
add(R[i][1],R[i][0],-1);
}
for (int i=0;i<N;i++){
// printf("Start=%d\n",i);
memset(vis,0,sizeof(vis));
dfs(i,0,-1);
}
answer(ans);
}
