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///YEAH IM THE BEST I'VE EVER WAS

///SO HAPPY

#include <bits/stdc++.h>

#define popcnt(x) __builtin_popcount(x)

#define fr first

#define sc second

#define m_p make_pair

#define low_bo(a, x) lower_bound(a.begin(), a.end(), x) - a.begin()

#define up_bo(a, x) upper_bound(a.begin(), a.end(), x) - a.begin()

#define unique(a) a.resize(unique(a.begin(), a.end()) - a.begin())

#define popcnt(x) __builtin_popcount(x)

//#include <ext/pb_ds/assoc_container.hpp>

//using namespace __gnu_pbds;

//gp_hash_table<int, int> table;

//#pragma GCC optimize("O3")
//#pragma GCC optimize("Ofast,no-stack-protector")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx")
//#pragma GCC target("avx,tune=native")
//float __attribute__((aligned(32)))

/*char memory[(int)1e8];

char memorypos;

inline void * operator new(size_t n){
    char * ret = memory + memorypos;
    memorypos += n;
    return (void *)ret;
}

inline void operator delete(void *){}
*/

using namespace std;

typedef long long ll;

typedef unsigned long long ull;

typedef long double ld;

typedef unsigned int uint;

ll sqr(ll x){
    return x * x;
}

int mysqrt(ll x){
    int l = 0, r = 1e9 + 1;
    while (r - l > 1){
        int m = (l + r) / 2;
        if (m * (ll)m <= x)
            l = m;
        else
            r = m;
    }
    return l;
}

#ifdef ONPC
    mt19937 rnd(231);
    mt19937_64 rndll(231);
#else
    mt19937 rnd(chrono::high_resolution_clock::now().time_since_epoch().count());
    mt19937_64 rndll(chrono::high_resolution_clock::now().time_since_epoch().count());
#endif
ll AR = 19, BR = 13, CR = 23, XR = 228, YR = 322, MODR = 1e9 + 993;

ll myrand(){
    ll ZR = (XR * AR + YR * BR + CR) % MODR;
    XR = YR;
    YR = ZR;
    return ZR;
}

int gcd(int a, int b){
    return a ? gcd(b % a, a) : b;
}

int gcdex(int a, int b, int &x, int &y){
    if (a == 0){
        x = 0;
        y = 1;
        return b;
    }
    int x1, y1;
    int ret = gcdex(b % a, a, x1, y1);
    x = y1 - (b / a) * x1;
    y = x1;
    return ret;
}

const int Mod = 1e9 + 7;

int Bpow(int x, ll y){
    int ret = 1;
    int w = x;
    while (y){
        if (y & 1)
            ret = (ret * (ll)w) % Mod;
        w = (w * (ll)w) % Mod;
        y >>= 1;
    }
    return ret;
}

int Bdiv(int x){
    int a, b;
    gcdex(x, Mod, a, b);
    if (a < 0)
        a += Mod;
    return a;
}

int Bdiv(int x, int y){
    return (x * (ll)Bpow(y, Mod - 2)) % Mod;
}

inline int ad(int x, int y){
    return x + y >= Mod ? x + y - Mod : x + y;
}

inline int dif(int x, int y){
    return x - y < 0 ? x - y + Mod : x - y;
}

inline int mul(int x, int y){
    return (x * (ll)y) % Mod;
}

int inv(int a){
    int b = Mod, x = 0, y = 1;
    while (a){
        int t = b / a;
        b -= a * t;
        x -= t * y;
        swap(a, b);
        swap(x, y);
    }
    if (x < 0)
        x += Mod;
    return x;
}

void setmin(int &x, int y){
    x = min(x, y);
}

void setmax(int &x, int y){
    x = max(x, y);
}

void setmin(ll &x, ll y){
    x = min(x, y);
}

void setmax(ll &x, ll y){
    x = max(x, y);
}

const ll llinf = 1e18 + 100;

const ld eps = 1e-9;

const int maxn = 5e3 + 10, maxw = 1e6 + 100, inf = 2e9 + 100, sq = 600, X = 43, LG = 17;

ll q[maxn][maxn][2];

int a[maxn];

int n;

vector<int> e[maxn];

int dfs(int v, int par) {
    int sz = 1;
    for (int i = 0; i <= n; i++)
        for (int t = 0; t < 2; t++)
        q[v][i][t] = llinf;
    q[v][0][(a[v] < 0)] = a[v];
    for (int i : e[v])
    if (i != par) {
        int to = dfs(i, v);
        ll p[to + sz + 2][2];
        for (int k = 0; k < to + sz + 2; k++)
            for (int t = 0; t < 2; t++)
                p[k][t] = llinf;
        for (int x = sz; x >= 0; x--)
        for (int t1 = 1; t1 >= 0; t1--)
        if (q[v][x][t1] != llinf)
            for (int y = to; y >= 0; y--)
            for (int t2 = 1; t2 >= 0; t2--)
            if (q[i][y][t2] != llinf) {
                ll X = q[v][x][t1], Y = q[i][y][t2];
                if (t2 == 0 || Y < 0)
                    setmin(p[x + y + 1][t1], X);
                if (t1 + t2 == 0)
                    setmin(p[x + y][0], X + Y);
                else
                    setmin(p[x + y][1], X + Y);
            }
        for (int k = 0; k < to + sz + 2; k++)
            for (int t = 0; t < 2; t++)
                q[v][k][t] = p[k][t];
        sz += to;
    }
    return sz;
}

int main()
{
    #ifdef ONPC
    //ifstream cin("a.in");
    //ofstream cout("a.out");
    freopen("a.in", "r", stdin);
    freopen("a.out", "w", stdout);
    #else
    //ifstream cin("gymnasts.in");
    //ofstream cout("gymnasts.out");
    //freopen("nextpartition.in", "r", stdin);
    //freopen("nextpartition.out", "w", stdout);
    #endif // ONPC
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n;
    for (int i = 0; i < n; i++)
        cin >> a[i];
    for (int i = 1; i < n; i++) {
        int v, u;
        cin >> v >> u;
        v--;
        u--;
        e[v].push_back(u);
        e[u].push_back(v);
    }
    dfs(0, -1);
    int ans = inf;
    for (int i = 0; i <= n; i++) {
        if (q[0][i][0] != llinf)
            setmin(ans, i);
        if (q[0][i][1] < 0)
            setmin(ans, i);
    }
    cout << ans;
}


Measured memory_bytes: 392704