#include<cstdio>
#include<iostream>
#include<algorithm>
#include<cstring>
#include<cmath>
//#include<vector>
//#include<set>
//#include<queue>
//#include<stack>
#define PII pair<int,int>
#define MP make_pair
using namespace std;
typedef long long LL;
typedef unsigned long long ULL;
typedef long double LDB;
inline LL read()
{
	LL s=0; bool w=0; char ch=getchar();
	while(ch<'0'||ch>'9'){if(ch=='-') w=1; ch=getchar();}
	while(ch>='0'&&ch<='9'){s=(s<<3)+(s<<1)+(ch^48); ch=getchar();}
	return w ? ~s+1 : s;
}

const int maxn = 5005;
const LL mod = 1000000007;

inline LL madd(LL a,LL b){a+=b; return a>=mod ? a-mod : a;}
inline LL msub(LL a,LL b){a-=b; return a<0    ? a+mod : a;}
inline LL M(LL a,LL b){return (a*b)%mod;}
LL qpow(LL bse,LL exp) {
	LL res = 1; while(exp) {
		if(exp&1){res = M(res,bse);}
		bse = M(bse,bse); exp>>=1;
	} return res;
}

LL jxig[maxn+10],jxiginv[maxn+10];
void init_math()
{
	jxig[0] = 1;
	for(int i=1; i<=maxn; i++) jxig[i] = M(jxig[i-1],i);
	jxiginv[maxn] = qpow(jxig[maxn],mod-2);
	for(int i=maxn-1; i>=0; i--) jxiginv[i] = M(jxiginv[i+1],i+1);
	return;
}
inline LL C(LL N,LL R){return N>=R ? M(jxig[N],M(jxiginv[R],jxiginv[N-R])) : 0;}

int n;
struct Edge { int v,nxt; }e[maxn<<1];
int h[maxn],ecnt;
void adde(int u,int v) { ecnt++; e[ecnt].v = v; e[ecnt].nxt = h[u]; h[u] = ecnt; return; }

LL f[maxn][maxn];
LL g[maxn];
int siz[maxn];

void DP(int u,int lst)
{
	siz[u] = 0;
	for(int i=0; i<=n; i++) g[i] = 0;
	f[u][0] = 1;
	for(int i=h[u]; i; i=e[i].nxt)
	{
		int v = e[i].v; if(v==lst) continue;
		DP(v,u);
		for(int j=siz[u]; j>=0; j--)
			for(int k=0; k<=siz[v]; k++)
				g[j+k] += M(M(f[v][k],f[u][j]),C(j+k,j));
		siz[u] += siz[v];
		for(int j=0; j<=siz[u]; j++) { f[u][j] = g[j]; g[j] = 0; }
	}
	siz[u]++;
	for(int i=siz[u]; i>=1; i--) { f[u][i] = f[u][i-1]; } f[u][0] = 0;
	for(int i=siz[u]-1; i>=0; i--) { f[u][i] = madd(f[u][i],f[u][i+1]); }
	return;
}

int main()
{
	//freopen("input.txt","r",stdin);
	//freopen("output.txt","w",stdout);
	init_math();
	n = read();
	for(int i=1; i<n; i++)
	{
		int u = read(); int v =read();
		adde(u,v); adde(v,u);
	}
	DP(1,0);
	printf("%lld\n",f[1][0]);
	//fclose(stdin);fclose(stdout);
	return 0;
}