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

void main()
{
    auto W = readln.strip.to!int;
    auto D = readln.strip.to!int;

    int work = W;
    foreach_reverse (d; 2 .. D + 1)
    {
        work -= work / d ^^ 2;
    }
    work.writeln;
}