import std;

alias sread = () => readln.chomp();
alias lread = () => readln.chomp.to!long();
alias aryread(T = long) = () => readln.split.to!(T[]);
//aryread!string();
//auto PS = new Tuple!(long,string)[](M);
//x[]=1;でlong[]全要素1に初期化
void main()
{
    auto n = lread();
    long ans = 1;
    long mod = (10 ^^ 9) + 7;
    long tmp;
    foreach (i; 0 .. n)
    {
        tmp = i + 1;
        tmp %= mod;
        ans %= mod;
        ans *= tmp;
    }
    writeln(ans % mod);

}

void scan(L...)(ref L A)
{
    auto l = readln.split;
    foreach (i, T; L)
    {
        A[i] = l[i].to!T;
    }
}

void arywrite(T)(T a)
{
    a.map!text.join(' ').writeln;
}
