import std.stdio;
import std.string;
import std.algorithm;
import std.array;
import std.conv;

void main()
{
    auto line = readln().chomp.to!(dchar[]);
    auto allLen = line.length;
    uint[] nums = line.dup.sort!"a < b".group!"a == b".map!"a[1]".array;
    writeln(allLen.fact() / nums.map!(a => fact(a)).reduce!"a * b" - 1);
}

ulong fact(ulong n)
in {
    assert(n >= 0);
}
body {
    ulong ret = 1;
    for (ulong i = n; i > 1; --i) {
        ret *= i;
    }
    return ret;
}