#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  long long dp[2010][2010];
  long long sum[2010][2010];
  long long s[2010], t[2010];
  long long n, m;
  cin >> n >> m;
  for (int i = 1; i <= n; i++) {
    cin >> s[i];
  }
  for (int i = 1; i <= m; i++) {
    cin >> t[i];
  }
  memset(dp, 0, sizeof(dp));
  dp[0][0] = 1;
  for (int i = 0; i <= n; i++) dp[i][0] = 1;
  for (int j = 0; j <= m; j++) dp[0][j] = 1;
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= m; j++) {
      dp[i][j] = dp[i - 1][j] + dp[i][j - 1] - dp[i - 1][j - 1];
      if (s[i] == t[j]) {
        dp[i][j] += dp[i - 1][j - 1];
        dp[i][j] = (dp[i][j]) % 1000000007;
      }
    }
  }
  cout << dp[n][m];
}
