#include <bits/stdc++.h>
using namespace std;
int n, m;
int a[2003];
int b[2003];
long long dp[2003][2003];
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie();
  cout.tie();
  cin >> n >> m;
  for (int i = 1; i <= n; ++i) cin >> a[i];
  for (int i = 1; i <= m; ++i) cin >> b[i];
  dp[0][0] = 1;
  for (int i = 1; i <= n; ++i) dp[i][0] = 1;
  for (int j = 1; 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]) % long long(1e9 + 7);
      if (a[i] == b[j])
        dp[i][j] = (dp[i][j] + dp[i - 1][j - 1]) % long long(1e9 + 7);
    }
  cout << dp[n][m];
  return 0;
}
