How to tclsh in packet tracer 5.1

I have another problem now... I want to start ping with high repeat
but this command also can't execute

R3# ping 10.1.1.1 repeat 100000

this is the error

R3#ping 10.1.1.1 repeat 100000
^
% Invalid input detected at '^' marker.

At priveliged exec mode, type:
ping
<cr>
IP
<cr>
xxx.xxx.xxx.xxx (the address you want to ping)

Then you get the prompt "Repeat Count[5]?
This is where you set the number of pings you want. Simply type a number...

Then <cr> through until you get to the end and pings will start. [ctrl][shift][6] will stop them if you don't want to wait for all the pings to complete.