Program excursion;

var
    N,K, S : LongInt;
    R       : AnsiString;

begin
{
    uncomment the two following lines if you want to read/write from files
    assign(input,  'input.txt');  reset(input);
    assign(output, 'output.txt'); rewrite(output);
}

    ReadLn(N);

    ReadLn(K);

    ReadLn(S);

    R := '';

   if K*N>=S then R:='YES'
             else R:='NO';
    WriteLn(R);

end.