def ist_enthalten(n, z):

    i = 0
    
    while i < len(z):

        m = z[i]

        if m == n:
            return True
        else:
            i += 1
            
    return False



z = [1,2,3,5,8,13,21,34]
print(ist_enthalten(7, z))
print(ist_enthalten(5, z))
print(ist_enthalten(60, z))