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*/

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

///SO HAPPY

#include <bits/stdc++.h>

#define fr first

#define sc second

#define m_p make_pair

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

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

#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;
}

mt19937 rnd(1227);

mt19937_64 rndll(12365);

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, int 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 = 4e18 + 100;

const double eps = 1e-9;

const int maxn = 2e3 + 5, maxw = 1e6 + 100, inf = 1e9 + 100, mod = 1e9 + 7;

int n;

int a[maxn], d[maxn], q[maxn], sz[maxn], ans = inf;

vector<int> e[maxn];

void dfs(int v, int p = -1) {
    sz[v] = a[v];
    d[v] = 0;
    vector<pair<int, int> > gs;
    for (int i : e[v])
    if (i != p) {
        dfs(i, v);
        sz[v] += sz[i];
        d[v] += d[i] + sz[i];
        gs.push_back({d[i] + sz[i], i});
    }
    if (gs.empty()) {
        q[v] = 0;
        return;
    }
    sort(gs.begin(), gs.end());
    reverse(gs.begin(), gs.end());
    q[v] = inf;
    for (auto i : gs) {
        q[v] = min(q[v], q[i.sc] + sz[i.sc] - (d[v] - i.fr));
        break;
    }
    q[v] = max(0, q[v]);
}

int main() {
    #ifdef ONPC
    freopen("a.in", "r", stdin);
    freopen("a.out", "w", stdout);
    #else
    //freopen("markchain.in", "r", stdin);
    //freopen("markchain.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++) {
        char c;
        cin >> c;
        a[i] = c - 48;
    }
    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);
    }
    for (int i = 0; i < n; i++) {
        dfs(i);
        if (q[i] == 0 && d[i] % 2 == 0)
            ans = min(ans, d[i] / 2);
    }
    if (ans == inf)
        ans = -1;
    cout << ans << '\n';
}


Measured memory_bytes: 640