4;

def positive_total(a: list) -> int:
    s = 0
    for i in a:
        if i>0:
            s+=i
    return s
    
print(positive_total(M))
print(positive_total(N))

5;

def is_prime(a: int) -> bool:
    for i in range(2,int(n**0.5)+1):
        if a%i==0:
            return False
    return a>=2

n = int(input('Nhap 1 so nguyen: '))
print(is_prime(n))