#include<bits/stdc++.h>

using namespace std;

using int64 = long long;

const int mod = 1e9 + 7;

int main() {
  int64 N;
  cin >> N;
  if(N >= mod) {
    cout << 0 << endl;
    return 0;
  }

  int64 mul = 1;
  for(int i = 2; i <= N; i++) {
    mul *= i;
    mul %= mod;
  }
  cout << mul << endl;
}