How to increase the amplitude of a step signal?

Hi, can i know how to change the amplitude of unit step. The amplitude of the unit step shown here is 1. I wanna change it to 5.

s = tf('s');
G = (s+6)/((s+4)*(s+7)*(s+9)*(s+12));
T = feedback(G,1);
t = (0:0.05:0.2)';
unitstep = t>=0;
[y,t,x] = lsim(T,unitstep,t);
plot(t,y,'y',t,unitstep,'m')
xlabel('Time (sec)')
ylabel('Amplitude')
ylim([0 5])
title('Input-purple, Output-yellow')

Answer 1

[Ameer Hamza]

Change line to

unitstep = 5*(t>=0);