import std.stdio,
       std.string,
       std.conv,
       std.range,
       std.math,
       std.bigint,
       std.algorithm,
       core.bitop;

void main()
{
    auto S = readln.strip.array.sort();

    long ans;
    do
    {
        ans++;
    } while (S.nextPermutation);
    (ans - 1).writeln;
}