def f(x,k,v):

if x <= 19:

return k in v

if k >= max(v):

return 0

h = [f(x-5,k+1,v)]

if x % 2 ==0:

h.append(f(x//2,k+1,v))

if x % 3 ==0:

h.append(f(x//3,k+1,v))

else:

h.append(f(x+1,k+1,v))

if k%2 != max(v) % 2:

return any(h)

else:

return all(h)

for x in range (19,1000):

if f(x,0,[1,3]) == 1 and f(x,0,[1]) == 0:

print('За­да­ние 20:',x)

def f(x,k,v):

if x <= 17:

return k in v

if k >= max(v):

return 0

h = [f(x-5,k+1,v)]

if x % 2 ==0:

h.append(f(x//2,k+1,v))

if x % 3 ==0:

h.append(f(x//3,k+1,v))

else:

h.append(f(x+1,k+1,v))

if k%2 != max(v) % 2:

return any(h)

else:

return all(h)

for x in range (17,1000):

if f(x,0,[1,3]) == 1 and f(x,0,[1]) == 0:

print('За­да­ние 20:',x)