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#include <iostream> #include <vector> #include <queue> using namespace std; int main() { int a,b,x,y,k=0; cin>>b>>a; vector<int>par[a+1]; bool v[a+1]; for(int i=0;i<b;i++) { cin>>x>>y; par[x].push_back(y); par[y].push_back(x); } for(int i=0;i<a;i++) { v[i]=false; } int s,ttl; cin>>s>>ttl; queue<int>Q; Q.push(s); Q.push(ttl); v[s]=true; while(!Q.empty()) { int teme=Q.front(); Q.pop(); int pat=Q.front(); Q.pop(); for(int i=0;i<par[teme].size();i++) { int sosed=par[teme][i]; if(!v[sosed] && pat>0) { Q.push(sosed); Q.push(pat-1); v[sosed]=true; } } } for(int i=0;i<a;i++) { if(!v[i]) { k++; } } cout<<k; return 0; }
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