clear
clc

x = 4;
steps = zeros(1,100);

for i = 1 :100000
    counter = 0;
    x = 4;
    while (x>1 && x<7)
        r = rand;
        if r<0.5
            x=x-1;
        else
            x=x+1;
        end
        counter = counter + 1;
    end
    steps(i)=counter;
end
mean(steps)