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x = 3
x = x + 2
print(x)

age = 14
if age < 14:
    print("A")
elif age < 18:
    print("B")
else:
    print("C")

for i in range(3):
    print(i, end=" ")

z = [4, 8, 15]
print(z[1] + len(z))

w = "Robot"
print(w[:3].upper())

d = {"a": 1}
d["b"] = d["a"] + 1
print(len(d), d["b"])

def f(a, b=2):
    return a * b

print(f(3) + f(1, 5))

try:
    print(10 / 0)
except ZeroDivisionError:
    print("zero")
print("go on")

print([n * n for n in range(4) if n % 2 == 0])

class Counter:
    def __init__(self):
        self.n = 0
    def plus(self):
        self.n += 1

a = Counter()
b = Counter()
a.plus()
a.plus()
print(a.n, b.n)