#include<bits/stdc++.h>
using namespace std;
const long long MX=5010,MO=1e9+7;
vector<long long>vec[MX];
inline void update(long long &x,long long y){x+=y;if(x>=MO)x-=MO;}
long long dp[MX][MX],g[MX],C[MX][MX],siz[MX],n;
void dfs(long long now,long long fa){
	dp[now][1]=1;
	siz[now]=1;
	for(auto to:vec[now]){
		if(to==fa)continue;
		dfs(to,now);
		for(long long j=1;j<=siz[now];j++){
			if(dp[now][j])  for(long long l=j;l<=j+siz[to];l++)  update(g[l],((dp[now][j]*dp[to][l-j]%MO)*C[l-1][j-1])%MO);
		}
		siz[now]+=siz[to];
		for(long long j=1;j<=siz[now];j++)  dp[now][j]=g[j],g[j]=0;
	}
	for(long long j=siz[now];j>=0;j--)  update(dp[now][j],dp[now][j+1]);
}
signed main(){
	scanf("%lld",&n);
	for(long long i=1;i<n;i++){
		long long x,y;scanf("%lld%lld",&x,&y);
		vec[x].push_back(y),vec[y].push_back(x);
	}
	C[0][0]=1;
	for(long long i=1;i<=n;i++){
		C[i][0]=1;
		for(long long j=1;j<=i;j++)  C[i][j]=(C[i-1][j-1]+C[i-1][j])%MO;
	}
	dfs(1,0);
	printf("%lld\n",dp[1][0]);
	return 0;
}

answer.code: In function 'void dfs(long long int, long long int)':
answer.code:10:11: error: 'to' does not name a type
  for(auto to:vec[now]){\x0d
           ^
answer.code:19:2: error: expected ';' before 'for'
  for(long long j=siz[now];j>=0;j--)  update(dp[now][j],dp[now][j+1]);\x0d
  ^
answer.code:19:2: error: expected primary-expression before 'for'
answer.code:19:2: error: expected ';' before 'for'
answer.code:19:2: error: expected primary-expression before 'for'
answer.code:19:2: error: expecte...