var v,p,s,l:real;

function sum(v:real;p:real):real;
  var s1:real;
  begin
    s1:=v+v*p/100;
    l:=l+1;
    if s1<s then s1:=sum(s1,p);
  end;


begin
  readln(v,p,s);
  l:=0;
  sum(v,p);
  writeln(l)
end.