#include 
#include 
#include 


using namespace std;



int main()
{
int a,b,x,y,k=0;
cin>>b>>a;
vectorpar[a+1];
bool v[a+1];
for(int i=0;i>x>>y;
par[x].push_back(y);
par[y].push_back(x);
}
for(int i=0;i>s>>ttl;
queueQ;
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;i0)
{
Q.push(sosed);
Q.push(pat-1);
v[sosed]=true;
}
}
}
for(int i=0;i