#include <bits/stdc++.h>
namespace chtholly {
char buf[1 << 23], *p1 = buf, *p2 = buf;
inline int read() {
  int x = 0, f = 1;
  char c = getchar();
  for (; !isdigit(c); c = getchar()) f ^= c == '-';
  for (; isdigit(c); c = getchar()) x = (x << 3) + (x << 1) + (c ^ '0');
  return f ? x : -x;
}
template <typename mitsuha>
inline bool read(mitsuha &x) {
  x = 0;
  int f = 1;
  char c = getchar();
  for (; !isdigit(c) && ~c; c = getchar()) f ^= c == '-';
  if (!~c) return 0;
  for (; isdigit(c); c = getchar()) x = (x << 3) + (x << 1) + (c ^ '0');
  return x = f ? x : -x, 1;
}
template <typename mitsuha>
inline int write(mitsuha x) {
  if (!x) return 0 & putchar(48);
  if (x < 0) putchar('-'), x = -x;
  int bit[20], i, p = 0;
  for (; x; x /= 10) bit[++p] = x % 10;
  for (i = p; i; --i) putchar(bit[i] + 48);
  return 0;
}
inline char fuhao() {
  char c = getchar();
  for (; isspace(c); c = getchar())
    ;
  return c;
}
}  // namespace chtholly
using namespace chtholly;
using namespace std;
const int yuzu = 2e5;
typedef int fuko[yuzu | 10];
vector<int> lj[yuzu | 10];
fuko a;
int zxy;
int dfs(int u, int lxy, int fa = 0) {
  if (a[u] % lxy) return 0;
  for (; a[u] % lxy == 0; a[u] /= lxy)
    ;
  vector<int> v;
  for (int i : lj[u])
    if (i ^ fa) v.push_back(dfs(i, lxy, u));
  sort(v.begin(), v.end(), greater<int>());
  int llx = 1;
  if (v.size()) llx += v[0];
  if (v.size() > 1) zxy = max(zxy, llx + v[1]);
  return zxy = max(zxy, llx), llx;
}
int main() {
  int i, j, n = read(), u, v;
  for (i = 1; i <= n; ++i) a[i] = read();
  for (i = 1; i < n; ++i) {
    read(u), read(v);
    lj[u].push_back(v);
    lj[v].push_back(u);
  }
  for (i = 1; i <= n; ++i) {
    for (j = 2; j * j <= a[i]; ++j)
      if (a[i] % j == 0) dfs(i, j);
    if (a[i] > 1) dfs(i, a[i]);
  }
  write(zxy), puts("");
}
