Bài 29

def la_nguyen_to(n):
    if n < 2:
        return False
    for i in range(2, int(n**0.5) + 1):
        if n % i == 0:
            return False
    return True

n = int(input("Nhap n: "))

dem = 0
for p in range(2, n - 1):
    if la_nguyen_to(p) and la_nguyen_to(p + 2):
        print(f"({p}, {p+2})")
        dem += 1

print(f"Tong so cap: {dem}")