govnokod

def perepad(str):
    result = 0
    prevchar = None
    for c in str:
        if (prevchar is None):
            prevchar = c
        else:
            if (prevchar == c):
                pass
            else:
                result += 1
                prevchar = c

    return result


sub1 = ""
output = 0
for i in ["0", "1"]:
    sub1 = i
    for j in ["0", "1"]:
        sub2 = sub1
        sub2 += j
        for k in ["0", "1"]:
            sub3 = sub2
            sub3 += k
            for l in ["0", "1"]:
                sub4 = sub3
                sub4 += l
                for m in ["0", "1"]:
                    sub5 = sub4
                    sub5 += m
                    if perepad(sub5) == 2:
                        output+=1

print(output)