def sus5cola(n):
return suscolaux(n,2,3,4)
def suscolaux(n,p,s,t):
if n == 0: return p
if n == 1: return s
if n == 2: return t
return suscolaux(n-1,s,t,p*2+s+t)
print(sus5cola(7))
ZGVmIHN1czVjb2xhKG4pOgoJcmV0dXJuIHN1c2NvbGF1eChuLDIsMyw0KQpkZWYgc3VzY29sYXV4KG4scCxzLHQpOgoJaWYgbiA9PSAwOiByZXR1cm4gcAoJaWYgbiA9PSAxOiByZXR1cm4gcwoJaWYgbiA9PSAyOiByZXR1cm4gdAoJcmV0dXJuIHN1c2NvbGF1eChuLTEscyx0LHAqMitzK3QpCnByaW50KHN1czVjb2xhKDcpKQ==