import std.algorithm, std.container, std.conv, std.math, std.range, std.typecons, std.stdio, std.string;

auto rdsp(){return readln.splitter;}
void pick(R,T)(ref R r,ref T t){t=r.front.to!T;r.popFront;}
void readV(T...)(ref T t){auto r=rdsp;foreach(ref v;t)pick(r,v);}

const mod = 10^^9+7;

void main()
{
  int n; readV(n);

  auto ans = 1L;
  foreach (i; 1..n+1)
    (ans *= i) %= mod;

  writeln(ans);
}
